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Average Height

 The average height of 25 boys

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Average Height

The average height of 25 boys is 1.4 m. When 5 boys leave the group, then the average height increases by 0.15 m. What is the average height of the 5 boys who leave?

Answer:

Total sum of heights including all 25 students = 25*1.4
                                                                          = 35 m
Average height after 5 students left becomes = 1.4+0.15
                                                                        = 1.55
Hence, the total sum of height of 20 students = 20*1.55
                                                                         = 31
Total sum of the left 5 boys are                 = 35- 31
                                                                   = 4
Hence, average height of the 5 boys = 4/5
                                                         = 0.8 m

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