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John has some cookies. If he gives each of his friends 5 cookies, there is no remainder. If he gives each of them 3 cookies instead, he will have 36 left. How many cookies does John have?
10 years ago

Answers

Reiny
let the number of cookies be x
let the number of friends by y

x - 5y = 0
x - 3y = 36
subtract them:
-2y = -36
y = 18

x - 5(18) = 0
x = 90

John has 90 cookies.
10 years ago

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