The following table shows the numbers of pairs of shoes of 6 different brands sold by a shop during a given week.

The shop also sells brand B7 now. The number of pairs of shoes sold of B7 are 20% more than the average number of shoes sold of the other 6 brands. What is the number of shoes sold of B7?

66

Average number of shoes sold = \(\frac{42 + 58 + 61 + 49 + 71 + 49 }{6}\)

= \(\frac{ 330 }{6}\)

= 55

Number of shoes sold from B7 = \(\frac{6}{5}\) × 55

= 66