Question

The ratio of red to blue to green

marbles in a bag is 3 : 10 :4. If there
are 39 red and blue marbles
altogether, how many green marbles
are there?

Answer 1

12 green marbles

Explanation:

first we know that there are 39 red and blue marbles, so 3x+10x=39 x=3

since the amount of green marbles is 4x, and we know x=3, x*4=12