Joan spend half of her paycheck going to the movies. She washed the family car and earned 7 dollars. What is her weekly paycheck if she ended up with 18 dollars?

her weekly allowance is $16

Step-by-step explanation:

Let x represent Joan's weekly paycheck.

Joan spent half of her paycheck going to the movies. This means that the total amount that she spent at the movies is x/2. The amount that she is left with would be

x - x/2 = x/2

She washed the family car and earned 7 dollars. This means that the total amount left with her is

x/2 + 7

if she ended with 18 dollars, it means that

x/2 + 7 = 18

x/2 = 18 - 7 = 11

x = 2 * 11 = $22