Question

Over time, a patient needs to get allergy shots totaling 60 mL. If the first 20 shots are each 0.5 mL, the next 20 shots are each 1 mL and thereafter each shot is 2 mL, how many shots does the patient get altogether?

Answer 1

20 × .5 = 10
20 × 1 = 20
60 - 10 = 50 - 20 = 30
30 ÷ 2 = 15
20 + 20 + 15 = 55