Question

the monthly pocket money of ravi and sanjeev are in the ratio 5:7.Their expenditures are in the ratio 3:5.If each saves Rs 80 every month, find their monthly pocket money.

Answer 1

ravi'spocket money=5x
sanj.... =7x
Ravi's exp...=3y
sanj........... =5y
5x-3y=80....(a)
7x-5y=80.....(b)
(a)*5 - (b)*3
25x-15y=400
21x-15y=240
x=40
ans=5x=5*40=200
7x=7*40=280



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Answer 2

Answer:

Step-by-step explanation

Let ravi pocket money be =5x

,, sanjiv ''. ". "=7x

Their expenditure be =3y and 5y repectively

And given 80 rupees = saving

So,equation formed = eq'a'=5x-3y=80

EQ'b'=7x-5y=8so eq a *5 beacause 5is the ratio-eq b *3=so value of x = 40 will come

Ravi pocket money=40*5=200

Sanjiv pocket money =40*7=280