Elijah has 366 marbles and Eric has 486 marbles. How many marbles must Eric give to Elijah so that Elijah will have 100 less marbles than Eric?
| |
Elijah |
Eric |
Total |
| Before |
366 |
486 |
852 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 100 |
852 |
The total number of marbles remains unchanged after Eric gives to Elijah.
Total number of marbles
= 366 + 486
= 852
Total number of marbles in the end
= 1 u + 1 u + 100
= 2 u + 100
2 u + 100 = 852
2 u = 852 - 100
2 u = 752
1 u = 752 ÷ 2 = 376
Number of marbles that Eric must give to Elijah
= 376 - 366
= 10
Answer(s): 10
