In a shop, the number of cartons of persimmon juice sold was
12 the number of cartons left. When 37 more cartons were sold, the total number of cartons sold was 8 less than
47 the number of cartons the shop had at first. How many cartons were left?
|
Sold |
Left |
Total |
Before |
1x7 = 7 u |
2x7 = 14 u |
3x7 = 21 u
|
Change |
+ 37 |
- 37 |
|
After |
7 u + 37 |
14 u - 37 |
21 u |
Comparing the total number of cartons sold and the total number of cartons at first |
4x3 - 8 = 12 u - 8 |
|
7x3 = 21 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 3 and 7 is 21.
The number of cartons sold in the end is repeated.
12 u - 8 = 7 u + 37
12 u - 7 u = 37 + 8
5 u = 45
1 u = 45 ÷ 5 = 9
Number of cartons left
= 14 u - 37
= 14 x 9 - 37
= 126 - 37
= 89
Answer(s): 89