Question

A bag contains 40 red and green marbles. The number of green marbles, g, is 9 times the number of red marbles, r.

How many red marbles are in the bag?

Answer 1

4 red marbles

Explanation:

r is the number of red marbles then green marbles is 9r , so

r + 9r = 40

10r = 40 ( divide both sides by 10 )

r = 4

there are 4 red marbles