In a mall, some toy cars and flying saucers were on sale. ¹₅ of the items were toy cars. ¹₃ of the toy cars and 161 flying saucers were sold. There were ¹₆ of the items left in the mall. How many toy cars and flying saucers were there in the mall at first?

	Toy cars	Flying saucers	Total
Comparing toy cars  and flying saucers at first	1x6 = 6 u	4x6 = 24 u	5x6 = 30 u
Before	3x2 =  6 u		6x5 = 30 u
Change	- 1x2 = - 2 u	- 161	- 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 flying saucers left
= 5 u - 4 u
= 1 u

Number of flying saucers sold
= 24 u - 1 u
= 23 u

23 u = 161

1 u = 161 ÷ 23 = 7

Number of toy cars and flying saucers at first
= 30 u
= 30 x 7
= 210

Answer(s): 210