In a stall, some toy cars and rubber balls were on sale. ¹₁₀ of the items were toy cars. ²₃ of the toy cars and 814 rubber balls were sold. There were ¹₉ of the items left in the stall. How many toy cars and rubber balls were there in the stall at first?

	Toy cars	Rubber balls	Total
Comparing toy cars  and rubber balls at first	1x9 = 9 u	9x9 = 81 u	10x9 = 90 u
Before	3x3 =  9 u		9x10 = 90 u
Change	- 2x3 = - 6 u	- 814	- 8x10 = - 80 u
After	1x3 = 3 u	7 u	1x10 = 10 u

 
The total number of toys at first is repeated.  Make the total number of toys at first the same. LCM of 10 and 9 is 90.

The number of toy cars at first is repeated.  Make the number of toy cars the same. LCM of 9 and 3 is 9. 

Number of rubber balls left
= 10 u - 3 u
= 7 u

Number of rubber balls sold
= 81 u - 7 u
= 74 u

74 u = 814

1 u = 814 ÷ 74 = 11

Number of toy cars and rubber balls at first
= 90 u
= 90 x 11
= 990

Answer(s): 990