A drink stall had 140 small and big packets of orange juice. The number of small packets is
311 of the number of big packets. After selling a few big packets of orange juice, there are
13 as many small packets as big packets left. How many big packets of orange juice were sold?
| |
Small packets |
Big packets |
Total |
| Before |
3 u |
11 u |
14 u |
| Change |
|
- 2 u |
|
| After |
1x3 =
3 u |
3x3 =
9 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 = 11 u
Total number of packets at first
= 3 u + 11 u
= 14 u
14 u = 140
1 u = 140 ÷ 14 = 10
Number of big packets sold
= 11 u - 9 u
= 2 u
= 2 x 10
= 20
Answer(s): 20
