In a stall, some toy cars and toy masks were on sale.
15 of the items were toy cars.
13 of the toy cars and 115 toy masks were sold. There were
16 of the items left in the stall. How many toy cars and toy masks were there in the stall at first?
| |
Toy cars |
Toy masks |
Total |
Comparing toy cars
and toy masks at first |
1x6 =
6 u |
4x6 =
24 u |
5x6 =
30 u |
| Before |
3x2 =
6 u |
|
6x5 =
30 u |
| Change |
- 1x2 =
- 2 u |
- 115
|
- 5x5 =
- 25 u |
| After |
2x2 =
4 u |
1 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 toy cars at first is repeated. Make the number of toy cars the same. LCM of 6 and 3 is 6.
Number of toy masks left
= 5 u - 4 u
= 1 u
Number of toy masks sold
= 24 u - 1 u
= 23 u
23 u = 115
1 u = 115 ÷ 23 = 5
Number of toy cars and toy masks at first
= 30 u
= 30 x 5
= 150
Answer(s): 150
