Oliver had a total of 160 white and purple balls. After giving away
17 of the white balls and 43 purple balls, there was an equal number of white and purple balls left. How many white balls did he have at first?
| |
White balls |
Purple balls |
Total |
| Before |
7 u |
6 u + 43 |
160 |
| Change |
- 1 u |
- 43 |
|
| After |
6 u |
6 u |
|
Total number of balls at first
= 7 u + 6 u + 43
= 13 u + 43
13 u + 43 = 160
13 u = 160 - 43
13 u = 117
1 u = 117 ÷ 13 = 9
Number of white balls that Oliver had at first
= 7 u
= 7 x 9
= 63
Answer(s): 63
