Question

A box contains 100 balls, of which r are red. If the probability of drawing a red ball is 0.3, how many red balls are there?

a) 30
b) 40
c) 50
d) 60

Answer 1

The number of red balls in the box is 30.

Step-by-step explanation:

To find the number of red balls, we can set up the equation:

Probability of drawing a red ball = Number of red balls / Total number of balls

Given that the probability is 0.3 and the total number of balls is 100, we can solve for the number of red balls:

0.3 = r / 100

r = 0.3 * 100

r = 30

Therefore, there are 30 red balls in the box.