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The average of the height of the 20 employee of the company is 1.5 m.In the month of June, two employees named Rita and Sumit left the company whose height are 1.4 m and 1.6 m respectively. In August, two more people left the company whose average of height is 1.7 m and one person join the company whose height is 87.5% of height of Sumit. Before the December, more four people left the company whose height are 1.3 m, 1.1 m, 1.32 m and 1.25 m respectively and more 5 people join the company whose height are 1.26 m, 1.18 m, 1.39 m and 1.4 m respectively. The average of height in the month of September is ….

The average of the height of the 20 employee of the company is 1.5 m.In the month of June, two employees named Rita and Sumit left the company whose height are 1.4 m and 1.6 m respectively. In August, two more people left the company whose average of height is 1.7 m and one person join the company whose height is 87.5% of height of Sumit. Before the December, more four people left the company whose height are 1.3 m, 1.1 m, 1.32 m and 1.25 m respectively and more 5 people join the company whose height are 1.26 m, 1.18 m, 1.39 m and 1.4 m respectively. The average of height in the month of September is …. Correct Answer 1.47

Sum of the height of 20 employee = 1.5 × 20 = 30 m

For the average in month of June,

Number of people available = 20 – 2 = 18

Sum of the height of 18 people = 30 – 1.4 – 1.6 = 27 m

Average height = 27/18 = 1.5 m

For the average in month of September,

Number of people available = 18 – 2 + 1 = 17

Sum of height of two person who left the company = 1.7 × 2 = 3.4 m

Height of person who join the company = 87.5% of height of Sumit = (7/8) × 1.6 = 1.4 m

Sum of the height of 17 people = 27 – 3.4 + 1.4 = 25 m

∴ Average of height in the month of September = 25/17 = 1.47 m

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