medium · GMAT Quant
Heater A operates for 3 minutes every 7-minute cycle. Heater B operates for 2 minutes every 4-minute cycle. Both turn on at t = 0.
For how many total minutes during the first 56 minutes is exactly one heater operating?
- 28 minutes
- 40 minutes
- 20 minutes
- 32 minutes
- 12 minutes
Sign up free to see the explanation and track your rank →
More GMAT Quant practice
- Including both endpoints, how many distinct integer price points are in this range?
- Which of the following expressions must result in a positive value?
- Which property of arithmetic justifies that first step?
- Which of the following must also be an even integer?
- Which of the following inequalities correctly represents this range?
- Which of the following includes the number 0?
- How many unique meal combinations can a customer create?
- What is the probability that the lightbulb is functional?