George has 128 balls and Seth has 357 balls. How many balls must Seth give to George so that George will have 87 less balls than Seth?
| |
George |
Seth |
Total |
| Before |
128 |
357 |
485 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 87 |
485 |
The total number of balls remains unchanged after Seth gives to George.
Total number of balls
= 128 + 357
= 485
Total number of balls in the end
= 1 u + 1 u + 87
= 2 u + 87
2 u + 87 = 485
2 u = 485 - 87
2 u = 398
1 u = 398 ÷ 2 = 199
Number of balls that Seth must give to George
= 199 - 128
= 71
Answer(s): 71
