Without actually solving the problem, choose the correct solution by deciding which choice satisfies the given conditions.
-Trish has two containers of water for a camping trip. One container holds 2 times as much as the other. The total amount of water is 21 gallons. How much water is in each container?
A) 21 gallons; 7 gallons
B) $7.5$ gallons; $13.5$ gallons
C) 7 gallons; 14 gallons
D) 6 gallons; 15 gallons

Question

Quizplus · Accepted Answer

The total amount of water is 21 gallons, and one container holds twice as much as the other. Only option C, with 7 gallons and 14 gallons, adds up to 21 gallons and satisfies the condition that one container holds twice as much as the other.

Without Actually Solving the Problem, Choose the Correct Solution by Deciding