Question

A bag contains 30 balls, 9 of which are blue. What percentage of the balls are not blue?

Answer 1

Answer:

70%

Step-by-step explanation:

  (30-9)/30 x100%

=21/30 x100%

=7/10 x100%

=70%

Answer 2

Answer:

70%

Step-by-step explanation:

You know that the amount of balls that are not blue is 30-9 = 21.

21 / 30 = x / 100

1. Cross multiply, then solve for x.

(sorry if it's not correct, i'm a student myself).