In a shop, the number of cartons of peach juice sold was
13 the number of cartons left. When 3 more cartons were sold, the total number of cartons sold was 12 less than
58 the number of cartons the shop had at first. How many cartons were there at first?
| |
Sold |
Left |
Total |
| Before |
1x2 =
2 u |
3x2 =
6 u |
4x2 =
8 u
|
| Change |
+ 3 |
- 3 |
|
| After |
2 u + 3 |
6 u - 3 |
8 u |
Comparing the total number
of cartons sold and the total
number of cartons at first |
5x1 - 12 =
5 u - 12 |
|
8x1 =
8 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 4 and 8 is 8.
The number of cartons sold in the end is repeated.
5 u - 12 = 2 u + 3
5 u - 2 u = 3 + 12
3 u = 15
1 u = 15 ÷ 3 = 5
Number of cartons at first
= 8 u
= 8 x 5
= 40
Answer(s): 40
