Question
The average age of (x + 2) students of a class is 14 years.
If the 56 years old class teacher is also included then average age of the class gets increased by three years. Find x% of 200.Solution
Total age of students = 14(x + 2) years
According to question,
[14(x + 2) + 56] = (14 + 3)(x + 2 + 1)
14x + 28 + 56 = 17x + 51
17x – 14x = 84 – 51
x = 11
So, 11% of 200 = 22
More Average Questions
24.99% of 1619.78 + (1259.84 ÷ 12.24) = ? × 16.98
13.232 + 19.98% of 549.99 = ? × 8.99
25.31% of 5199.90 + (19.9 × 17.11) + 46.021 =? + 168.98
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.)...
? * 4.89 = (410.15 ÷ 13.97) % of 6190 - 1342.77
(74.93% of 640.11 + 3/4 of 359.79)² - (1/3 of 80.87 × 2)² = ?
? = {29.7% of (97.72 × 40.04)} ÷ 3.92
√81.02 + 11.836 of 24.98 = ?2 + 20.01
Relevant for Exams:
