In a shop, the number of cartons of dragonfruit juice sold was
12 the number of cartons left. When 80 more cartons were sold, the total number of cartons sold was 11 less than
78 the number of cartons the shop had at first. How many cartons were there at first?
| |
Sold |
Left |
Total |
| Before |
1x8 =
8 u |
2x8 =
16 u |
3x8 =
24 u
|
| Change |
+ 80 |
- 80 |
|
| After |
8 u + 80 |
16 u - 80 |
24 u |
Comparing the total number
of cartons sold and the total
number of cartons at first |
7x3 - 11 =
21 u - 11 |
|
8x3 =
24 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 3 and 8 is 24.
The number of cartons sold in the end is repeated.
21 u - 11 = 8 u + 80
21 u - 8 u = 80 + 11
13 u = 91
1 u = 91 ÷ 13 = 7
Number of cartons at first
= 24 u
= 24 x 7
= 168
Answer(s): 168
