In a mall, some frisbees and dolls were on sale.
15 of the items were frisbees.
23 of the frisbees and 42 dolls were sold. There were
16 of the items left in the mall. How many frisbees and dolls were there in the mall at first?
| |
Frisbees |
Dolls |
Total |
Comparing frisbees
and dolls at first |
1x6 =
6 u |
4x6 =
24 u |
5x6 =
30 u |
| Before |
3x2 =
6 u |
|
6x5 =
30 u |
| Change |
- 2x2 =
- 4 u |
- 42
|
- 5x5 =
- 25 u |
| After |
1x2 =
2 u |
3 u |
1x5 =
5 u |
The total number of toys at first is repeated. Make the total number of toys at first the same. LCM of 5 and 6 is 30.
The number of frisbees at first is repeated. Make the number of frisbees the same. LCM of 6 and 3 is 6.
Number of dolls left
= 5 u - 2 u
= 3 u
Number of dolls sold
= 24 u - 3 u
= 21 u
21 u = 42
1 u = 42 ÷ 21 = 2
Number of frisbees and dolls at first
= 30 u
= 30 x 2
= 60
Answer(s): 60
