In a kiosk, some rubber balls and toy planes were on sale. ¹₁₁ of the items were rubber balls. ¹₃ of the rubber balls and 212 toy planes were sold. There were ¹₆ of the items left in the kiosk. How many rubber balls and toy planes were there in the kiosk at first?

	Rubber balls	Toy planes	Total
Comparing rubber balls  and toy planes at first	1x6 = 6 u	10x6 = 60 u	11x6 = 66 u
Before	3x2 =  6 u		6x11 = 66 u
Change	- 1x2 = - 2 u	- 212	- 5x11 = - 55 u
After	2x2 = 4 u	7 u	1x11 = 11 u

 
The total number of toys at first is repeated.  Make the total number of toys at first the same. LCM of 11 and 6 is 66.

The number of rubber balls at first is repeated.  Make the number of rubber balls the same. LCM of 6 and 3 is 6. 

Number of toy planes left
= 11 u - 4 u
= 7 u

Number of toy planes sold
= 60 u - 7 u
= 53 u

53 u = 212

1 u = 212 ÷ 53 = 4

Number of rubber balls and toy planes at first
= 66 u
= 66 x 4
= 264

Answer(s): 264