Tommy has 362 marbles and Ethan has 427 marbles. How many marbles must Ethan give to Tommy so that Tommy will have 57 less marbles than Ethan?
| |
Tommy |
Ethan |
Total |
| Before |
362 |
427 |
789 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 57 |
789 |
The total number of marbles remains unchanged after Ethan gives to Tommy.
Total number of marbles
= 362 + 427
= 789
Total number of marbles in the end
= 1 u + 1 u + 57
= 2 u + 57
2 u + 57 = 789
2 u = 789 - 57
2 u = 732
1 u = 732 ÷ 2 = 366
Number of marbles that Ethan must give to Tommy
= 366 - 362
= 4
Answer(s): 4
