Yesterday, Mae had 13 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 |
13 |
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 = 13
5 u = 13 - 3
5 u = 10
1 u = 10 ÷ 5 = 2
Number of local stamps yesterday
= 3 u
= 3 x 2
= 6
Answer(s): 6