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Sagot :
Melanie's weekly allowance is $18
Explanation:let Melanie allowance = b
She spent half of it on movies = 1/2 × b = b/2
Amount left after removing movie cost = b - b/2
Then earned an additional $9 = (b - b/2) + 9
The total money Melanie has now = $18
b - b/2 + 9 = 18
[tex]\begin{gathered} \frac{b}{1}-\frac{b}{2}+9=18 \\ \frac{b}{1}-\frac{b}{2}=18-9 \\ \frac{2b-b}{2}=9 \end{gathered}[/tex][tex]\begin{gathered} \frac{b}{2}=\text{ 9} \\ b\text{ = 9(2)b } \\ b\text{ = 18} \end{gathered}[/tex]Hence, Melanie's weekly allowance is $18
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