10 Math for Automotive Technicians Copyright Goodheart-Willcox Co., Inc. May not be reproduced or posted to a publicly accessible website. Name _______________________________________________ Date ___________________ Class ____________________ Subtraction Practice Problems 2.4 (a) A technician owes $437 for professional mechanic’s tools. He plans to pay $205 this week toward his tool bill. Calculate how much he will owe after this payment is applied to his account. (b) A repair shop has 43 quarts of 5W-20 oil in stock. This week, they have four oil changes scheduled that will use a total of 19 quarts of 5W-20 oil. Calculate how many quarts of oil will be in stock after this week. (c) A technician is measuring radiator effi ciency. The upper radiator hose mea- sures 209°F. The lower radiator hose measures 167°F. Calculate the change in temperature from the upper radiator hose to the lower radiator hose. (d) A cooling system fl ush is recommended at 90,000 miles on a vehicle with 78,432 miles. Calculate how many miles until the cooling system fl ush is recommended. (e) A customer is comparing two sets of brake pads based on price. The premium brake pads cost $67. The economy brake pads cost $39. Calculate the differ- ence in price between the premium and economy brake pads.