Question
The average age of A and B is 19 years. If A is to be
replaced by C, the average would be 18 years. The average age of C and A is 20 years. Find the age of A.Solution
A + B = 2 × 19 = 38 yr B + C = 2 × 18 = 36 yr C + A = 2 × 20 = 40 yr On adding all three, 2 (A + B + C) = 38 + 36 + 40 = 114 ⇒ A + B + C = 57 ∴ A = (A + B + C) – (B + C) = 57 – 36 = 21 yr
What approximate value should replace the question mark?
3.98% of 1250.50 − 45% of 2000 = ? − 5000.60
Find the approximate value of Question mark(?). There is no requirement to find the exact value.
? = 599.77 – 14.08 × 20.11 + (12.93)²
50.098% of 7000.072 ÷ 69.6969 + 75.093 of 15.98 = ? × 4.983
- 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.)
{26.11 x 13.96 - (346.95 - 26.04 x 4.18)} = ?
√49 + 6.66% of 1725 + 22² = ?² - √361
- 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.)
? = 38.97² ÷ (3.99⁵ + 5.89 × 107.32) + 58.24% of (512.12 × 21.07)
What approximate value should come in the place of (?) in the following questions?
19.98% of 349.89- √290 * ? = √82 % of 399
√31684.11 × √728.9 – (19.02)2 = ? × 4.99
