A drink stall had 108 big and small bottles of water. The number of big bottles is
27 of the number of small bottles. After selling a few small bottles of water, there are
13 as many big bottles as small bottles left. How many small bottles of water were sold?
|
Big bottles |
Small bottles |
Total |
Before |
2 u |
7 u |
9 u |
Change |
|
- 1 u |
|
After |
1x2 = 2 u |
3x2 = 6 u |
|
The number of big bottles remains unchanged. Make the number of big bottles the same. LCM of 2 and 1 is 2.
Number of big bottles at first = 2 u
Number of small bottles at first = 7 u
Total number of bottles at first
= 2 u + 7 u
= 9 u
9 u = 108
1 u = 108 ÷ 9 = 12
Number of small bottles sold
= 7 u - 6 u
= 1 u
= 12
Answer(s): 12