There are 125 balls in a bag. 0.2 of them are brown balls, and the rest are gold and grey balls. If there are 14 as many gold balls as grey balls. How many grey balls are there?
| Brown balls |
Gold balls |
Grey balls |
Total |
| 1 u |
4 u |
5 u |
| |
1 p |
4 p |
|
0.2 =
210 =
15 Fraction of balls that are gold and grey balls
= 1 -
15 =
45 Total number of balls = 5 u
5 u = 125
1 u = 125 ÷ 5 = 25
Number of gold balls and grey balls
= 4 u
= 4 x 25
= 100
Number of gold and grey balls
= 1 p + 4 p
= 5 p
5 p = 100
1 p = 100 ÷ 5 = 20
Number of grey balls
= 4 p
= 4 x 20
= 80
Answer(s): 80
