Yesterday, Mae had 40 local and foreign stamps. Today, she gave away
13 of her local stamps and 5 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 + 5 |
40 |
Change |
- 1 u |
- 5 |
|
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 + 5
= 5 u + 5
5 u + 5 = 40
5 u = 40 - 5
5 u = 35
1 u = 35 ÷ 5 = 7
Number of local stamps yesterday
= 3 u
= 3 x 7
= 21
Answer(s): 21