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For a trip, the average age of 45 students is 20 years. If two students cancelled due to an emergency so three teachers joined the student's group. The new average age of group for the trip is 21 years. What will be the approximate average age of three teachers group if the average age of two students who cancelled their trip is 19 years?

For a trip, the average age of 45 students is 20 years. If two students cancelled due to an emergency so three teachers joined the student's group. The new average age of group for the trip is 21 years. What will be the approximate average age of three teachers group if the average age of two students who cancelled their trip is 19 years? Correct Answer 35 years 

Total age of 45 students = 45 × 20 = 900

Total age of 2 students = 19 × 2 = 38

Total age of 43 students = 900 – 38 = 862

New average age of 46 people in trip = 46 × 21 = 966

Total age of 3 teacher's = 966 – 862 = 104

Average age of 3 teachers = 104/3 = 34.66 years

∴ Average age of 3 teachers ≈ 35 years

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