Yesterday, Mae had 79 local and foreign stamps. Today, she gave away
14 of her local stamps and 9 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 + 9 |
79 |
Change |
- 1 u |
- 9 |
|
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 + 9
= 7 u + 9
7 u + 9 = 79
7 u = 79 - 9
7 u = 70
1 u = 70 ÷ 7 = 10
Number of local stamps yesterday
= 4 u
= 4 x 10
= 40
Answer(s): 40