A drink stall had 90 small and big bottles of water. The number of small bottles is
27 of the number of big bottles. After selling a few big bottles of water, there are
13 as many small bottles as big bottles left. How many big bottles of water were sold?
| |
Small bottles |
Big bottles |
Total |
| Before |
2 u |
7 u |
9 u |
| Change |
|
- 1 u |
|
| After |
1x2 =
2 u |
3x2 =
6 u |
|
The number of small bottles remains unchanged. Make the number of small bottles the same. LCM of 2 and 1 is 2.
Number of small bottles at first = 2 u
Number of big bottles at first = 7 u
Total number of bottles at first
= 2 u + 7 u
= 9 u
9 u = 90
1 u = 90 ÷ 9 = 10
Number of big bottles sold
= 7 u - 6 u
= 1 u
= 10
Answer(s): 10
