There are 150 balls in a bag. 0.3 of them are red balls, and the rest are purple and white balls. If there are 14 as many purple balls as white balls. How many white balls are there?
| Red balls |
Purple balls |
White balls |
Total |
| 3 u |
7 u |
10 u |
| |
1 p |
4 p |
|
0.3 =
310 =
310 Fraction of balls that are purple and white balls
= 1 -
310 =
710 Total number of balls = 10 u
10 u = 150
1 u = 150 ÷ 10 = 15
Number of purple balls and white balls
= 7 u
= 7 x 15
= 105
Number of purple and white balls
= 1 p + 4 p
= 5 p
5 p = 105
1 p = 105 ÷ 5 = 21
Number of white balls
= 4 p
= 4 x 21
= 84
Answer(s): 84
