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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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