Post mathematic related questions here

OP
rst

rst

Youngling
Re: mathematic related questions

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NEW OBJECTIVE QUESTION

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Also plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
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A

avj

Broken In
Re: mathematic related questions

rst said:
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NEW OBJECTIVE QUESTION

*img191.imageshack.us/img191/6536/formulaj.png

Also plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
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Click to expand...

it is option 1
take area of each small square as 1
total area is n(n+1) (n rows and n+1 columns)
area of one half is 1+2+3... (number of squares in each row(left)/column(right))
so total area is 2*(1+2+3....)
 
OP
rst

rst

Youngling
Re: mathematic related questions

answer is absolutely right
Also thanks for the explanation
 
OP
rst

rst

Youngling
Re: mathematic related questions

----------------------------------------------------------------------------------------------------------------------
NEW OBJECTIVE QUESTION

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Also plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
----------------------------------------------------------------------------------------------------------------------
 
OP
rst

rst

Youngling
Re: mathematic related questions

ans is b. 10 %

Can someone explain it ??
 
Last edited:
OP
rst

rst

Youngling
Re: mathematic related questions

Monthly deposit,P=350
Time,n=6 years
=72 months


total deposit money=350 x 72
=25200

total received money=32865

so interest= 32865- 25200
=7665

Now interest = PNr/100-----------------(1)
where N= n (n+1) /24
=(72 x 73) /24
=219

so 7665= (350 x 219 x r)/100
r= 10
 
OP
rst

rst

Youngling
Re: mathematic related questions

----------------------------------------------------------------------------------------------------------------------
NEW OBJECTIVE QUESTION

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Plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)
----------------------------------------------------------------------------------------------------------------------
 
Last edited:
Niilesh

Niilesh

Padawan
Re: mathematic related questions

24 Days

Solution - Let the work be equal to 'x' units
then work done by one man in 1 hour = x/(9*28*8)
Let the required no. of days be 'y'
Then
x/(9*28*8) *(12*7*y) = x

=>Y=24 Days
 
OP
rst

rst

Youngling
Re: mathematic related questions

ans is correct
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let number of days be x

Now number of men and no. of days are in indirect proportion
Also number of hours and no. of days are in indirect proportion

So 8* 9 * 28= 12* 7 *x
x=24
 
Last edited:
Niilesh

Niilesh

Padawan
Re: mathematic related questions

rst said:
Monthly deposit,P=350
Time,n=6 years
=72 months


total deposit money=350 x 72
=25200

total received money=32865

so interest= 32865- 25200
=7665

Now interest = PNr/100-----------------(1)
where N= n (n+1) /24
=(72 x 73) /24
=219

so 7665= (350 x 219 x r)/100
r= 10
Click to expand...
Can you explain that?

also does the interest gets added monthly(not 10% each month but 1/12th part of that 10%) or yearly?

rst said:
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NEW OBJECTIVE QUESTION

*img33.imageshack.us/img33/9770/puzzl.png

Also plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)

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ans is (B) 3
Click to expand...
Can you explain that? :)
 
OP
rst

rst

Youngling
Re: mathematic related questions

Niilesh said:
Can you explain that?

also does the interest gets added monthly(not 10% each month but 1/12th part of that 10%) or yearly?
Click to expand...
here r is annual rate of interest

rst said:
----------------------------------------------------------------------------------------------------------------------
NEW OBJECTIVE QUESTION

*img33.imageshack.us/img33/9770/puzzl.png

Also plz explain your answer

(Also you can ask your mathematics related questions or queries
we will try to solve them)

----------------------------------------------------------------------------------
Click to expand...

In first two figures there is difference of 3 between them
so answer is 3
 
Niilesh

Niilesh

Padawan
Re: mathematic related questions

rst said:
here r is annual rate of interest
Click to expand...
You got me wrong, how did you find the value of N?

also I wanted to know if does the interest gets added monthly(not 10% each month but 1/12th part of that 10%) or yearly
Like after 350 is added will it become 350* 100+r/( 100*12) after one month?

rst said:
In first two figures there is difference of 3 between them
so answer is 3
Click to expand...
in the last two fig the difference is not equal to 5 in every case ( 6+5 =11)
 
Last edited:
OP
rst

rst

Youngling
Re: mathematic related questions

Niilesh said:
hmm..
So you must have got the solution after seeing the answer (?)
Click to expand...

you can say that



Niilesh said:
You got me wrong, how did you find the value of N?

also I wanted to know if does the interest gets added monthly(not 10% each month but 1/12th part of that 10%) or yearly
Like after 350 is added will it become 350* 100+r/( 100*12) after one month?
Click to expand...
In monthly recurring deposit
interest = PNr/100
where N= n (n+1) /24

Its the easy way to rember the formula
Its like the simple interest formula
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In given question
Monthly deposit,P=350
Time,n=6 years
=72 months

In monthly recurring deposit, we deposit money each month
so principal is changing per month


principal for 1st month = 350
principal for 2nd month =2 x 350
principal for 3rd month =3 x 350
.
.
.
principal for 72nd month =72x 350

Total principal or premium= 350+ 2 x 350 +3 x 350 +.....+72x 350
=350 (1+2+......+72)
in general
Total principal or premium=P (1+2+............+n)
=[P n (n+1) ]/2

interest = Total premium x rate/100 X 1/12
=[Pn(n+1) ]/2 x r/100 X 1/12
= PNr/100
where N= n (n+1) /24
 
M

mastercool8695

Cyborg Agent
Re: mathematic related questions

You guys have the potential to Launch
"the solutions to 'TEST OF MATHEMATICAS AT 10+2 LEVEL'"

i'll join with questions from day..
 
Niilesh

Niilesh

Padawan
Re: mathematic related questions

@rst Ohh.. i thought it was compound interest. thanks for the solution BTW
but i am more comfortable with the Sum of GP method

mastercool8695 said:
You guys have the potential to Launch
"the solutions to 'TEST OF MATHEMATICAS AT 10+2 LEVEL'"

i'll join with questions from day..
Click to expand...
Nah, I am in 12th so still can't solve 12th topics :mrgreen:
 
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