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.
Please help,
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?
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