Question

The ratio of stamps collected by Babu and molly is 3:7, when Babu gave 42 stamps to molly the ratio became 1:3. How many stamps were there with molly?

Answer 1

Answer:

FIRST TRY IT YOURSELF.

Answer 2

Answer:

630

Step-by-step explanation:

We can assume that babu has 3x stamps and Molly has 7x

If babu gives the 42 stamp to him, then stamps left with him are 3x - 42 and stamps with Molly are 7x + 42

After giving the 42 stamps to molly, ratio becomes 1:3

We can cross multiply now

1 ( 7x + 42 ) = 3 ( 3x - 42 )

7x + 42 = 9x - 126

42 + 126 = 9x - 7x

168 = 2x

x = 84

So, the stamps with molly before the exchange were 84 × 7 i.e. 58

and the stamps with molly after the exchange were 7 × 84 + 42 = 588 + 42 = 630......

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