In a shop, the number of cartons of mango juice sold was
14 the number of cartons left. When 61 more cartons were sold, the total number of cartons sold was 9 less than
910 the number of cartons the shop had at first. How many cartons were there at first?
|
Sold |
Left |
Total |
Before |
1x2 = 2 u |
4x2 = 8 u |
5x2 = 10 u
|
Change |
+ 61 |
- 61 |
|
After |
2 u + 61 |
8 u - 61 |
10 u |
Comparing the total number of cartons sold and the total number of cartons at first |
9x1 - 9 = 9 u - 9 |
|
10x1 = 10 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 5 and 10 is 10.
The number of cartons sold in the end is repeated.
9 u - 9 = 2 u + 61
9 u - 2 u = 61 + 9
7 u = 70
1 u = 70 ÷ 7 = 10
Number of cartons at first
= 10 u
= 10 x 10
= 100
Answer(s): 100