A drink stall had 77 big and small packets of soy milk. The number of big packets is
25 of the number of small packets. After selling a few small packets of soy milk, there are
12 as many big packets as small packets left. How many small packets of soy milk were sold?
| |
Big packets |
Small packets |
Total |
| Before |
2 u |
5 u |
7 u |
| Change |
|
- 1 u |
|
| After |
1x2 =
2 u |
2x2 =
4 u |
|
The number of big packets remains unchanged. Make the number of big packets the same. LCM of 2 and 1 is 2.
Number of big packets at first = 2 u
Number of small packets at first = 5 u
Total number of packets at first
= 2 u + 5 u
= 7 u
7 u = 77
1 u = 77 ÷ 7 = 11
Number of small packets sold
= 5 u - 4 u
= 1 u
= 11
Answer(s): 11
