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Question

hi, please help :

Keith and Mike had some chocolates in the ratio 2 : 5 When Mike gave away 40 chocolates to Keith and ate 20 chocolates himself, the ratio of keith’s chocolates to that of Mike’s chocolates became 2 : 1 How many chocolates did Mike have at first?

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Answer

Before,
K => [U][U]
M => [U][U][U][U][U]

After,
K => [U][U] + 40 => [U+20][U+20]
M => [U+20] (coz K:M is 2:1)

But, M gave away 40 and ate 20
=>[U+20] + 40 + 20 = 5U
Therefore U = 20, and 5U = 100

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