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