There are 200 balls in a basket. 0.4 of them are black balls, and the rest are green and gold balls. If there are 17 as many green balls as gold balls. How many gold balls are there?
| Black balls |
Green balls |
Gold balls |
Total |
| 2 u |
3 u |
5 u |
| |
1 p |
7 p |
|
0.4 =
410 =
25 Fraction of balls that are green and gold balls
= 1 -
25 =
35 Total number of balls = 5 u
5 u = 200
1 u = 200 ÷ 5 = 40
Number of green balls and gold balls
= 3 u
= 3 x 40
= 120
Number of green and gold balls
= 1 p + 7 p
= 8 p
8 p = 120
1 p = 120 ÷ 8 = 15
Number of gold balls
= 7 p
= 7 x 15
= 105
Answer(s): 105
