Problema Solution
Madeleine has red, blue, and green marbles. There are 28 marbles in all. 8 of them are blue and there are 3 times as many red marbles as green. How many red marbles are there? Explain.
Answer provided by our tutors
We assume there are 3x red marbles, x green ones
So the equation is
3x+x+8 = 28
So
x = 5
So there are 15 red marbles