Tim has 270 marbles and George has 404 marbles. How many marbles must George give to Tim so that Tim will have 120 less marbles than George?
| |
Tim |
George |
Total |
| Before |
270 |
404 |
674 |
| Change |
+ ? |
- ? |
|
| After |
1 u |
1 u + 120 |
674 |
The total number of marbles remains unchanged after George gives to Tim.
Total number of marbles
= 270 + 404
= 674
Total number of marbles in the end
= 1 u + 1 u + 120
= 2 u + 120
2 u + 120 = 674
2 u = 674 - 120
2 u = 554
1 u = 554 ÷ 2 = 277
Number of marbles that George must give to Tim
= 277 - 270
= 7
Answer(s): 7
