Question
In a group of 28 friends, the average age is 22 years.
One person aged 20 leaves, and 2 new people with an average age of 24 years join. When a new member’s age is also included, the average age becomes 23 years. What is the age of the new member?Solution
Initial total age = 28 × 22 = 616 years
Age of 2 new members = 2 × 24 = 48 years Let the new member’s age be ‘y’ years.
New total age = 616 - 20 + 48 + y = (644 + y) years
New total number of people = 28 - 1 + 2 + 1 = 30
New total age = 30 × 23 = 690 years
So, age of the new member = 690 - 644 = 46 years
More Average Questions
12.5% of (100 + ?) = 40
2/9 of 5/8 of 3/25 of ? = 40
24 × √? + 4008 ÷ 24 = 40% of 200 + 327
7(1/2) – 3(5/6) = ? − 2(7/12)
280 ÷ 14 + 11 × 12 – 15 × 6 = ?
1550 ÷ 62 + 54.6 x 36 = (? x 10) + (28.5 x 40)
25% of 1000 + 10% of 150 – 22 × ? = 45
√ 729 × 5 – 220 % of 15 + ? = 120% of 160
What will come in the place of question mark (?) in the given expression?
(40% of ? × 43 ) – 232 = 751
180 % of 45 + √144 × 8 = ?2 + 80 % of 70
