Yesterday, Mae had 42 local and foreign stamps. Today, she gave away
13 of her local stamps and 2 of her foreign stamps. Now, she has an equal number of local and foreign stamps. How many local stamps did she have yesterday?
|
Local stamps |
Foreign stamps |
Total |
Before |
3 u |
2 u + 2 |
42 |
Change |
- 1 u |
- 2 |
|
After |
2 u |
2 u |
|
Mae has an equal number of local and foreign stamps in the end.
Total number of stamps yesterday
= 3 u + 2 u + 2
= 5 u + 2
5 u + 2 = 42
5 u = 42 - 2
5 u = 40
1 u = 40 ÷ 5 = 8
Number of local stamps yesterday
= 3 u
= 3 x 8
= 24
Answer(s): 24