John and Julian had a total of 72 marbles. Julian had half as many marbles as John. How many marbles must John give to Julian so they have an equal number of marbles?
|
John |
Julian |
Total |
Before |
2 u |
1 u |
72 |
Change |
- ? |
+ ? |
|
After |
1 |
1 |
|
Total number of marbles at first = 3 u
1 u = 72 ÷ 3 = 24
John and Julian have an equal number of marbles in the end.
Number of marbles that Julian has in the end
= 72 ÷ 2
= 36
Number of marbles that John must give to Julian
= 36 - 24
= 12
Answer(s): 12