In a shop, the number of cartons of orange juice sold was
15 the number of cartons left. When 61 more cartons were sold, the total number of cartons sold was 5 less than
79 the number of cartons the shop had at first. How many cartons were left?
| |
Sold |
Left |
Total |
| Before |
1x3 =
3 u |
5x3 =
15 u |
6x3 =
18 u
|
| Change |
+ 61 |
- 61 |
|
| After |
3 u + 61 |
15 u - 61 |
18 u |
Comparing the total
number of cartons
sold and the total number of cartons at first |
7x2 - 5 =
14 u - 5 |
|
9x2 =
18 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 6 and 9 is 18.
The number of cartons sold in the end is repeated.
14 u - 5 = 3 u + 61
14 u - 3 u = 61 + 5
11 u = 66
1 u = 66 ÷ 11 = 6
Number of cartons left
= 15 u - 61
= 15 x 6 - 61
= 90 - 61
= 29
Answer(s): 29
