There are 100 balls in a basket. 0.2 of them are gold balls, and the rest are green and yellow balls. If there are 37 as many green balls as yellow balls. How many yellow balls are there?
| Gold balls |
Green balls |
Yellow balls |
Total |
| 1 u |
4 u |
5 u |
| |
3 p |
7 p |
|
0.2 =
210 =
15 Fraction of balls that are green and yellow balls
= 1 -
15 =
45 Total number of balls = 5 u
5 u = 100
1 u = 100 ÷ 5 = 20
Number of green balls and yellow balls
= 4 u
= 4 x 20
= 80
Number of green and yellow balls
= 3 p + 7 p
= 10 p
10 p = 80
1 p = 80 ÷ 10 = 8
Number of yellow balls
= 7 p
= 7 x 8
= 56
Answer(s): 56
