Alice spent 5/11 of her money on a back pack. She has $42 dollars left. How much was her back pack?

Correct result:

b =  35


x - b = 42
b = 5/11 x

x - b = 42
b = 5/11•x

b-x = -42
11b-5x = 0

b = 35
x = 77

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