Solve the problem.
-A bag of marbles has twice as many blue marbles as green marbles, and the bag has at least 39 marbles in it. At least how many green marbles does it have?
A)At least 20 green marbles
B)At least 26 green marbles
C)At least 13 green marbles
D)At least 14 green marbles

Question

Quizplus · Accepted Answer

Let G be the number of green marbles and B be the number of blue marbles. The problem states B = 2G and there are at least 39 marbles, so B + G ≥ 39. Substituting B = 2G gives 2G + G ≥ 39, which simplifies to 3G ≥ 39. Dividing both sides by 3 gives G ≥ 13, meaning there are at least 13 green marbles.

Solve the Problem. -A Bag of Marbles Has Twice as Many Blue Marbles