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Note : ratio of Andy in the questions were 2 and 5 respectively. So it is good to choose 10u as 2 and 5 are factors for 10.

If Andy had 10u stickers, Ken had 1ou * 3/2 = 15u stickers and Zack had 1ou*2/5 = 4u stickers.

10u + 15u + 4u = 435

29u = 435

u = 15

15u – 4u = 11u = 165

Ken had 165 stickers more than Zack. 

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