In a shop, the number of cartons of persimmon juice sold was
13 the number of cartons left. When 56 more cartons were sold, the total number of cartons sold was 7 less than
47 the number of cartons the shop had at first. How many cartons were there at first?
| |
Sold |
Left |
Total |
| Before |
1x7 =
7 u |
3x7 =
21 u |
4x7 =
28 u
|
| Change |
+ 56 |
- 56 |
|
| After |
7 u + 56 |
21 u - 56 |
28 u |
Comparing the total number
of cartons sold and the total
number of cartons at first |
4x4 - 7 =
16 u - 7 |
|
7x4 =
28 u |
The total number of cartons is repeated. Make the total number of cartons the same. LCM of 4 and 7 is 28.
The number of cartons sold in the end is repeated.
16 u - 7 = 7 u + 56
16 u - 7 u = 56 + 7
9 u = 63
1 u = 63 ÷ 9 = 7
Number of cartons at first
= 28 u
= 28 x 7
= 196
Answer(s): 196
