In a shop, the number of cartons of lemon juice sold was
12 the number of cartons left. When 36 more cartons were sold, the total number of cartons sold was 8 less than
79 the number of cartons the shop had at first. How many cartons were there at first?
| |
Sold |
Left |
Total |
| Before |
1x3 =
3 u |
2x3 =
6 u |
3x3 =
9 u
|
| Change |
+ 36 |
- 36 |
|
| After |
3 u + 36 |
6 u - 36 |
9 u |
Comparing the total number
of cartons sold and the total
number of cartons at first |
7x1 - 8 =
7 u - 8 |
|
9x1 =
9 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 3 and 9 is 9.
The number of cartons sold in the end is repeated.
7 u - 8 = 3 u + 36
7 u - 3 u = 36 + 8
4 u = 44
1 u = 44 ÷ 4 = 11
Number of cartons at first
= 9 u
= 9 x 11
= 99
Answer(s): 99
