A drink stall had 81 small and big packets of orange juice. The number of small packets is
27 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 |
2 u |
7 u |
9 u |
| Change |
|
- 1 u |
|
| After |
1x2 =
2 u |
3x2 =
6 u |
|
The number of small packets remains unchanged. Make the number of small packets the same. LCM of 2 and 1 is 2.
Number of small packets at first = 2 u
Number of big packets at first = 7 u
Total number of packets at first
= 2 u + 7 u
= 9 u
9 u = 81
1 u = 81 ÷ 9 = 9
Number of big packets sold
= 7 u - 6 u
= 1 u
= 9
Answer(s): 9
