Answer:
18
Step-by-step explanation:
If he spends half his money then washes the family car and he ends up with 18 dollars that means he spent 9 witch is half of 18 and he adds 9 more dollars which is why his allowance is 18 dollars
fraction are not integers
x=-0.5
the question is -9=18x
we divide both sides by 9
-1=2x
divide both sides by 2
