Emma has some erasers. She has 9 less erasers in Packet T than in Packet U. After 21 erasers were transferred from Packet U to Packet T, there were 66 erasers in Packet U.
- How many erasers were there in Packet U at first?
- How many erasers were there in Packet T in the end?
|
Packet T |
Packet U |
Before |
1 u |
1 u + 9 |
Change |
+ 21 |
- 21 |
After |
1 u + 21 |
66 |
(a)
Number of erasers in Packet U at first
= 66 + 21
= 87
(b)
Number of erasers in Packet T at first
= 87 - 9
= 78
Number of erasers in Packet T in the end
= 78 + 21
= 99
Answer(s): (a) 87; (b) 99