Question
The average age of a group is 40 years. When two members
having an average age of 58 years leave the group, the average age drops by 3 years. What was the original number of people in the group?Solution
ATQ,
Let the number of people in the group initially be 'n'.
(40n - 2 × 58) ÷ (n - 2) = 40 - 3
Or, 40n - 116 = 37n - 74
Or, 3n = 42
Or, n = 14
More Average Questions
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
(24.98)2 = ?2 + (14.99)2
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
9.95% of 1299.99 + 19.95 × 17.05 - 299.99 = ?
6106.11 ÷ √? × 55.9 = 3976.21
79.79% of 299.87 - 54.67% of (39.982 - 9.822 ) = ? - 19.92 × 199.98
? % of 759.96 + 932.99 = 1237.01
8.15 of 124.95 ÷ 40.13 + 249.84 X 14.18 - √325 X 149.87 = ? X 10.85
– (8.002)³ + (30.001)² - (4.01)⁴ =?
24.98% of 1682 × (18.2659 ÷ 9.04965)(–4) = ?
Relevant for Exams:
