Yesterday, Mae had 38 local and foreign stamps. Today, she gave away
13 of her local stamps and 3 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 + 3 |
38 |
Change |
- 1 u |
- 3 |
|
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 + 3
= 5 u + 3
5 u + 3 = 38
5 u = 38 - 3
5 u = 35
1 u = 35 ÷ 5 = 7
Number of local stamps yesterday
= 3 u
= 3 x 7
= 21
Answer(s): 21