Determine how many red balls are in the box, using the following information.A box has blue and red balls. If there are 20 blue balls, the...

The probability is the ratio between the number of
possible events and the total number of events.

P =
the number of possible events/total number of events

Let's
put the number of blue balls as b and the number of red balls as
a.

But b = 20

The total number
of balls is: a+b = a + 20

Let's consider the balls as being
the events. The posisbility of picking a red ball is
a.

Probability is:

P =
a/(a+20)

But P = 4/6

P =
2/3

2/3 = a/(a+20)

We'll cross
multiply and w'ell get:

3a = 2a +
40

a = 40

The
number of red balls from the box is a = 40 red
balls.