Average Practice Test 7

Question : 20 of 22

Marks: +1, -0

Twenty boys are to be divided into two sections A and B with 12 and 8 boys respectively. The average height of the boys of Section A is 153 cm and that of all 20 boys is 163 cm. What is the average height of boys of Section B?

341.52 cm
178 cm
340 cm
342 cm
179 cm

Validate

Solution:

Total height of 12 boys of Section A = (153 × 12) cm = 1,836 cm
Total height of 20 boys = (163 × 20) cm = 3,260 cm
∴ Required average

=(3260-1836)/8=178\cm

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