Question

A bag contains 12 red marbles, 5 yellow marbles, and 15 gree marbles. How many red marbles must be added to the 32 marbles already in the bag so that the probability of randomly selecting a red marble is 3/5?

Answer 1

x = number of red marbles to add

12 red marbles already, so we will have 12+x red after we add x more red marbles

32 marbles total ----> 32+x total

Answer 2

\[\Large \frac{12+x}{32+x} = \frac{3}{5}\]

solve for x

Answer 3

So the answer would be 18, right?

Answer 4

yes it is

Answer 5

Thank you!

Answer 6

yw