Ian and Pierre had a total of 138 marbles. Pierre had half as many marbles as Ian. How many marbles must Ian give to Pierre so they have an equal number of marbles?
|
Ian |
Pierre |
Total |
Before |
2 u |
1 u |
138 |
Change |
- ? |
+ ? |
|
After |
1 |
1 |
|
Total number of marbles at first = 3 u
1 u = 138 ÷ 3 = 46
Ian and Pierre have an equal number of marbles in the end.
Number of marbles that Pierre has in the end
= 138 ÷ 2
= 69
Number of marbles that Ian must give to Pierre
= 69 - 46
= 23
Answer(s): 23