Julie sold 3 boxes of cupcakes for a total of $15 and 4 equally-priced boxes of danish. She made a total of $31.
Total amount of sold cupcakes = 15
Let x be the amount of each box of Danish
4 boxes of Danish sold.
Total amount of Danish sold = 4x
Total amount of sold cupcakes + Total amount of sold Danish = $31
15 + 4x = 31
Subtract 15 on both sides
15 + 4x -15 = 31 - 15
4x = 16
Divide by 4 on both sides
x = 4
$4 is the price of each box of Danish.
