George has 245 balls and Oliver has 447 balls. How many balls must Oliver give to George so that George will have 122 less balls than Oliver?
| |
George |
Oliver |
Total |
| Before |
245 |
447 |
692 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 122 |
692 |
The total number of balls remains unchanged after Oliver gives to George.
Total number of balls
= 245 + 447
= 692
Total number of balls in the end
= 1 u + 1 u + 122
= 2 u + 122
2 u + 122 = 692
2 u = 692 - 122
2 u = 570
1 u = 570 ÷ 2 = 285
Number of balls that Oliver must give to George
= 285 - 245
= 40
Answer(s): 40
