Ethan has 271 marbles and Luke has 389 marbles. How many marbles must Luke give to Ethan so that Ethan will have 68 less marbles than Luke?
| |
Ethan |
Luke |
Total |
| Before |
271 |
389 |
660 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 68 |
660 |
The total number of marbles remains unchanged after Luke gives to Ethan.
Total number of marbles
= 271 + 389
= 660
Total number of marbles in the end
= 1 u + 1 u + 68
= 2 u + 68
2 u + 68 = 660
2 u = 660 - 68
2 u = 592
1 u = 592 ÷ 2 = 296
Number of marbles that Luke must give to Ethan
= 296 - 271
= 25
Answer(s): 25
