Betty and Zara had an equal number of chocolate bars. After Betty bought another 29 chocolate bars and Zara bought another 7 chocolate bars, Betty had thrice as many chocolate bars as Zara. Find the number of chocolate bars that each of them had at first.
| |
Betty |
Zara |
| Before |
3 u - 29 |
1 u - 7 |
| Change |
+ 29 |
+ 7 |
| After |
3 u |
1 u |
The number of chocolate bars that Betty and Zara had at first is the same.
3 u - 29 = 1 u - 7
3 u - 1 u = 29 - 7
2 u = 22
1 u = 22 ÷ 2 = 11
Number of chocolate bars that each had at first
= 11 - 7
= 4
Answer(s): 4
