1 Answer

JamieP · Answer 1 · 2019-12-20T14:50:09+0000

Let's call the unknown amount of money x

Betty spend 5/12 of her money (5/12)x and had 42 dollars left. Translated,

$x - \frac 5{12} x = 42$

Solving,

$x(1 - \frac 5{12}) = 42$

(7)/(12) x = 42

$x = (12)/(7) \cdot 42 = 72$

Answer: $72

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