Carl, Vaidev and Andy have some stickers. The ratios of their stickers are as follows:

Carl : (Carl + Vaidev + Andy) = 2 : 5
Vaidev : (Carl + Andy) = 1 : 5

Andy has 40 stickers more than Vaidev. In the end, Andy gives away all he has to Vaidev and Carl so that both Vaidev and Carl end up with the same number of stickers, how many stickers has Vaidev received from Andy?

Vaidev	Andy	Carl	Total
3x6		2x6	5x6
1x5	5x5		6x5
5 u	13 u	12 u	30 u

The total number of stickers is repeated.  Make the total number of stickers the same.  LCM of 5 and 6 is 30.

Number of stickers that Andy has more than Vaidev
= 13 u - 5 u
= 8 u

8 u = 40

1 u = 40 ÷ 8 = 5

	Vaidev	Andy	Carl
Before	5 u	13 u	12 u
Change	+ 10 u	- 13 u	+ 3 u
After	15 u	0 u	15 u

Number of stickers that Vaidev has received from Andy
= 15 u - 5 u 
= 10 u
= 10 x 5
= 50

Answer(s): 50