Question

In a box of stones, the ratio of red marbles to total marbles is 2:5. The ratio of green stones to total stones is 3:10. If the stones that are neither red nor green are blue, how many blue stones are in the box if there are 40 marbles in the box?

Answer 1

Answer:

12 blue stones

Steps:

40/5 = 8

8 x 2 = 16 red stones

40/10 = 4

4 x 3 = 12 green stones

40 - (12 + 16) = 12 blue stones

hope this helps!