Emma has a box of counters. The counter are green, red or blue.

She picks a counter at random. The table below shows the probability that she picks a green counter and the probability that she picks a red counter.

Color | Probability

Red | 0.6

Green | 0.25

Blue |

a) what is the probability that Emma gets a blue counter?

b) There are ten counters in the box. How many green counters are there?

c) Emma picks a counter at random. She replaces it in the box and then picks another counter at random.

(I don't get how it works and also I already know the answers but they didn't give the solution. I just want to understand better)