Tom and Ian had a total of 60 stamps. Ian had half as many stamps as Tom. How many stamps must Tom give to Ian so they have an equal number of stamps?
| |
Tom |
Ian |
Total |
| Before |
2 u |
1 u |
60 |
| Change |
- ? |
+ ? |
|
| After |
1 |
1 |
|
Total number of stamps at first = 3 u
1 u = 60 ÷ 3 = 20
Tom and Ian have an equal number of stamps in the end.
Number of stamps that Ian has in the end
= 60 ÷ 2
= 30
Number of stamps that Tom must give to Ian
= 30 - 20
= 10
Answer(s): 10
