Bobby has 379 chocolate bars and Harry has 771 chocolate bars. How many chocolate bars must Harry give to Bobby so that Bobby will have nine times as many chocolate bars as Harry?
|
Bobby |
Harry |
Total |
Before |
379 |
771 |
1150 |
Change |
+ ? |
- ? |
|
After |
9 u |
1 u |
10 u |
Total number of chocolate bars
= 379 + 771
= 1150
Total number of chocolate bars
= 9 u + 1 u
= 10 u
10 u = 1150
1 u = 1150 ÷ 10 = 115
Number of chocolate bars that Harry must give Bobby
= 771 - 115
= 656
Answer(s): 656