Archie has 309 marbles and Liam has 446 marbles. How many marbles must Liam give to Archie so that Archie will have 69 less marbles than Liam?
|
Archie |
Liam |
Total |
Before |
309 |
446 |
755 |
Change |
+ ? |
- ? |
|
After |
1 u |
1 u + 69 |
755 |
The total number of marbles remains unchanged after Liam gives to Archie.
Total number of marbles
= 309 + 446
= 755
Total number of marbles in the end
= 1 u + 1 u + 69
= 2 u + 69
2 u + 69 = 755
2 u = 755 - 69
2 u = 686
1 u = 686 ÷ 2 = 343
Number of marbles that Liam must give to Archie
= 343 - 309
= 34
Answer(s): 34