The ratio of electric 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 sports cars and saloon cars in the ratio of 2 : 1. If there were 306 more electric cars than sports cars, how many saloon cars were there?

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

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

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

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

17 u = 306

1 u = 306 ÷ 17 = 18

Number of saloon cars
= 2 u
= 2 x 18
= 36

Answer(s): 36