If i have 500 dollars how much i need to make 1800 dollars

You have $500 and want/need $1800. You would subtract the amount you want with the amount you have.

1800-500=1300

You need to acquire $1300

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.