Question

Solve for the following: the price of a field trip is represented by P=$5a+$3c. If the price of the field trip is $85 and there are 20 children, c, how many adult are there?

Answer 1

P=$5a+$3c

$85 = $5a+$3(20)

$85 = $5a + $60

$85-$60 = $5a + $60-$60

$25 = $5a

$25/$5 = $5a/$5

a = 5


Check
P=$5a+$3c
$85=$5(5)+$3(20)
$85=$25 + $60
$85=$85