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Algebra

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Three Friends

ALGEBR-ENFN8B

Three friends went to the zoo. The total cost was $\$18.50$.

One friend paid $\$7.50$, and one paid $\$3.50$.

What was the cost for the other friend? Choose which equation would best represent the cost for the third friend.

A

$18.50 - 7.50 + x = 3.50$
$x = -7.50$

B

$x + 3.50 + 10.00 = 18.50$
$x = 5$

C

$7.50 + 3.50 + x = 18.50$
$x = 7.50$

D

$x - 18.50 = 12.00$
$x = 30.50$