The ratio of saloon cars to the total number of cars on display in Ken's car shop was 7 : 10. ¹₃ of the remaining cars on display were family cars and the rest were electric cars and sports cars in the ratio of 2 : 1. If there were 68 more saloon cars than electric cars, how many sports cars were there?

Saloon Cars	Family Cars	Electric Cars	Sports Cars	Total Cars
7x3	3x3			10x3
	1x3	2x3		3x3
		2x2	1x2
21 u	3 u	4 u	2 u

The total number of electric cars and sports cars is the combined repeated identity. Make the total number of electric cars and sports cars the same. LCM of 2 and 3 is 6.

The total number of family cars, electric cars and sports cars is the next combined repeated identity. Make the total number of family cars, electric cars and sports cars the same. LCM of 3 and 3 is 9. 

Number of more saloon cars than electric cars
= 21 u - 4 u
= 17 u

17 u = 68

1 u = 68 ÷ 17 = 4

Number of sports cars
= 2 u
= 2 x 4
= 8

Answer(s): 8