Yesterday, Mae had 70 local and foreign stamps. Today, she gave away
15 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 |
5 u |
4 u + 7 |
70 |
Change |
- 1 u |
- 7 |
|
After |
4 u |
4 u |
|
Mae has an equal number of local and foreign stamps in the end.
Total number of stamps yesterday
= 5 u + 4 u + 7
= 9 u + 7
9 u + 7 = 70
9 u = 70 - 7
9 u = 63
1 u = 63 ÷ 9 = 7
Number of local stamps yesterday
= 5 u
= 5 x 7
= 35
Answer(s): 35