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