In a box containing marbles, 78 are blue, 24 are orange, and the rest are green. If the probability of selecting a green marble is 2/5, how many green marbles are in the box?

Question

vocaloid · Answer

hint: set up a proportion

let x = number of green marbles

green marbles/total marbles = 2/5

know where to go from there?

anonymous · Answer

ok but i don't have the total marbles

anonymous · Answer

$$\frac{g}{g+78+24}=\frac{2}{5} $$Solve the above for g, the number of green marbles.
Mathematica came up with g = 68 .

anonymous · Answer

thnx

anonymous · Answer

bye

anonymous · Answer

Your welcome.