In a shop, the number of cartons of kiwi juice sold was
13 the number of cartons left. When 87 more cartons were sold, the total number of cartons sold was 12 less than
710 the number of cartons the shop had at first. How many cartons were there at first?
| |
Sold |
Left |
Total |
| Before |
1x5 =
5 u |
3x5 =
15 u |
4x5 =
20 u
|
| Change |
+ 87 |
- 87 |
|
| After |
5 u + 87 |
15 u - 87 |
20 u |
Comparing the total number
of cartons sold and the total
number of cartons at first |
7x2 - 12 =
14 u - 12 |
|
10x2 =
20 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 4 and 10 is 20.
The number of cartons sold in the end is repeated.
14 u - 12 = 5 u + 87
14 u - 5 u = 87 + 12
9 u = 99
1 u = 99 ÷ 9 = 11
Number of cartons at first
= 20 u
= 20 x 11
= 220
Answer(s): 220
