The ratio of saloon cars to the total number of cars on display in Ken's car shop was 2 : 7. ³₅ of the remaining cars on display were family cars and the rest were sports cars and electric cars in the ratio of 2 : 1. If there were 8 more saloon cars than sports cars, how many electric cars were there?

Saloon Cars	Family Cars	Sports Cars	Electric Cars	Total Cars
2x3	5x3			7x3
	3x3	2x3		5x3
		2x2	1x2
6 u	9 u	4 u	2 u

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

The total number of family cars, sports cars and electric cars is the next combined repeated identity. Make the total number of family cars, sports cars and electric cars the same. LCM of 5 and 5 is 15. 

Number of more saloon cars than sports cars
= 6 u - 4 u
= 2 u

2 u = 8

1 u = 8 ÷ 2 = 4

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

Answer(s): 8