In a shop, the number of cartons of starfruit juice sold was
12 the number of cartons left. When 5 more cartons were sold, the total number of cartons sold was 10 less than
56 the number of cartons the shop had at first. How many cartons were left?
|
Sold |
Left |
Total |
Before |
1x2 = 2 u |
2x2 = 4 u |
3x2 = 6 u
|
Change |
+ 5 |
- 5 |
|
After |
2 u + 5 |
4 u - 5 |
6 u |
Comparing the total number of cartons sold and the total number of cartons at first |
5x1 - 10 = 5 u - 10 |
|
6x1 = 6 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 3 and 6 is 6.
The number of cartons sold in the end is repeated.
5 u - 10 = 2 u + 5
5 u - 2 u = 5 + 10
3 u = 15
1 u = 15 ÷ 3 = 5
Number of cartons left
= 4 u - 5
= 4 x 5 - 5
= 20 - 5
= 15
Answer(s): 15