Ann, Bill and Ken shared some stamps in the ratio 2 : 3 : 4. After a game the ratio became 5 : 2 : 2. If Ann won 21 stamps how many did Ken lose?

Difference between the ratios of Ann

= 5 – 2 = 3

$: 3 Rightarrow 21$

$herefore quad: 1=frac{21}{3}=7$

Ken lost : 2 stamps : 2 = 2 × 7 = 14