In a kiosk, some toy masks and toy cars were on sale.
15 of the items were toy masks.
13 of the toy masks and 370 toy cars were sold. There were
19 of the items left in the kiosk. How many toy masks and toy cars were there in the kiosk at first?
| |
Toy masks |
Toy cars |
Total |
Comparing toy masks
and toy cars at first |
1x9 =
9 u |
4x9 =
36 u |
5x9 =
45 u |
| Before |
3x3 =
9 u |
|
9x5 =
45 u |
| Change |
- 1x3 =
- 3 u |
- 370
|
- 8x5 =
- 40 u |
| After |
2x3 =
6 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 9 is 45.
The number of toy masks at first is repeated. Make the number of toy masks the same. LCM of 9 and 3 is 9.
Number of toy cars left
= 5 u - 6 u
= -1 u
Number of toy cars sold
= 36 u - -1 u
= 37 u
37 u = 370
1 u = 370 ÷ 37 = 10
Number of toy masks and toy cars at first
= 45 u
= 45 x 10
= 450
Answer(s): 450
