There are 73 red, blue, and green marbles in a jar. There are twice as many red marbles as blue marbles. There are 19 more blue marbles than green marbles. How many green marbles are there?
Answer 4
One method of figuring this out is by trial and error. By working in reverse order of the problem's sentences, we can start by guessing that there is just one green marble. After that, we find that there are 20 blue marbles and 40 red marbles for a total of only 61. Continuing in this strategy with larger totals of green marbles, we eventually land on 4 green marbles as the correct answer, with 23 blue marbles and 46 red marbles in the jar for a total of 73 marbles.
Asked by Ben Jenkins · Last updated 3 years ago · 617 views · SOURCE
