Question

Colton has a change jar that contains $7.75 in half dollars and quarters. He has 13 more quarters than half dollars. How many of each type of coin does he have?

Answer 1

X= number of half dollars
x + 13= number of quarters


$0.50x + $0.25(x + 13)= $7.75


$0.50x + $0.25(x + 13)= $7.75
multiply 0.25 by parentheses

0.50x + (0.25 * x) + (0.25 * 13)= 7.75

0.50x + 0.25x + 3.25= 7.75
combine like terms

0.75x + 3.25= 7.75
subtract 3.25 from both sides

0.75x= 4.50
divide both sides by 0.75

x= 6 half dollars


QUARTERS
= x + 13
= 6 + 13
= 19 quarters


CHECK
$0.50x + $0.25(6 + 13)= $7.75
0.50(6) + 0.25(19)= 7.75
3 + 4.75= 7.75
7.75= 7.75


ANSWER: There are 6 half dollars and 19 quarters.

Hope this helps! :)