Question

A bag contains 30 marbles, 3 of which are blue, 20 are red, 5 are green, and 2 are purple. Emerson takes a marble out of the bag, records the color, and returns it to the bag. How many purple marbles should he expect after 300 trials?

a. 20
b. 30
c. 50
d. 200

Answer 1

Ok, so there is 30 marbles in total, and 300 trials are done, meaning its a 3:10 ratio between marbles and trials.
So to find the amount of purple ones compared to the trials, multiply the amount of purple marbles by he 10 from the ratio of marbles to trials (3:10)

Answer 2

the 10*

Answer 3

2*10=20

Answer 4

exactly

Answer 5

ok thanx