Mary spent 2/5 of her money and had $60 left. How much did she have at first.

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So the answer is {{{x=100}}}
This means that Mary had $100 originally.
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Let x = original amount of money
Since we know that because "Mary spent 2/5 of her money", she'll have {{{3/5}}} of her money left (since {{{1-2/5=3/5}}}). So she has {{{(3/5)x}}} dollars left. Now we also know that she has "$60 left", so this means that {{{(3/5)x=60}}}
{{{(3/5)x=60}}} Start with the given equation.
{{{3x=5(60)}}} Multiply both sides by 5.
{{{3x=300}}} Multiply.
{{{x=(300)/(3)}}} Divide both sides by {{{3}}} to isolate {{{x}}}.
{{{x=100}}} Reduce.
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