Ernie has an income of $40 which he plans to spend on cookies and milk. The price of milk is $1 per gallon, and the price of cookies is $2 per dozen. If Ernie buys 12 gallons of milk, how many dozens of cookies will he buy if he spends all of his income?
A) 28
B) 20
C) 14
D) 12

Question

Quizplus · Accepted Answer

Ernie spends $12 on milk (12 gallons x $1 per gallon = $12) and has $28 left to spend on cookies. 
Since cookies cost $2 per dozen, Ernie can buy 14 dozens of cookies (28 ÷ 2 = 14).

Ernie Has an Income of $40 Which He Plans to Spend