A drink stall had 140 small and big packets of milk. The number of small packets is
317 of the number of big packets. After selling a few big packets of milk, there are
15 as many small packets as big packets left. How many big packets of milk were sold?
| |
Small packets |
Big packets |
Total |
| Before |
3 u |
17 u |
20 u |
| Change |
|
- 2 u |
|
| After |
1x3 =
3 u |
5x3 =
15 u |
|
The number of small packets remains unchanged. Make the number of small packets the same. LCM of 3 and 1 is 3.
Number of small packets at first = 3 u
Number of big packets at first = 17 u
Total number of packets at first
= 3 u + 17 u
= 20 u
20 u = 140
1 u = 140 ÷ 20 = 7
Number of big packets sold
= 17 u - 15 u
= 2 u
= 2 x 7
= 14
Answer(s): 14
