The following table shows the number of trucks of 6 different brands sold from a showroom during a given period of time.

There are 8 tyres on each truck, irrespective of the brand of the truck. What is the average number of tyres per brand?

280

Total number of tyres on all truck of all brand = 45× 8 + 35× 8 + 36×8 + 44× 8 + 28× 8 + 22× 8

= 360 + 280 + 288 + 352 + 224 + 176

= 1680

Average number of tyres per brand = \(\frac{1680 }{6}\)

= 280