Yesterday, Mae had 28 local and foreign stamps. Today, she gave away
14 of her local stamps and 7 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 |
4 u |
3 u + 7 |
28 |
Change |
- 1 u |
- 7 |
|
After |
3 u |
3 u |
|
Mae has an equal number of local and foreign stamps in the end.
Total number of stamps yesterday
= 4 u + 3 u + 7
= 7 u + 7
7 u + 7 = 28
7 u = 28 - 7
7 u = 21
1 u = 21 ÷ 7 = 3
Number of local stamps yesterday
= 4 u
= 4 x 3
= 12
Answer(s): 12