A student is studying for their physics final. It takes them 15 minutes to do a practice problem. They have 8.5 hours to study before the exam. How many practice problems can the student complete?

Question

Quizplus · Accepted Answer

This is a ratio/proportion problem. We have 15 minutes for each practice problem. So, how many problems can they complete in 8.5 hours? We can write that as a proportion: First, we need to convert the minutes to hours: 15 minutes ÷ 60 minutes = 0.25 hours 0.25: 1 :: 8.5: x Step 1: Rewrite the proportion as a fraction. ^0.25/₁ = ^8.5/ x Step 2: Cross multiply. 0.25x = 1 * 8.5 Step 3: Simplify. 0.25x = 8.5 0.25x ÷ 0.25 = 8.5 ÷ 0.25 34 = x

A Student Is Studying for Their Physics Final