Question
The following expressions form a series followed by a
(?). Find the odd one out first and then find that what will come in place of the question mark (?) according to the corrected series? (x - 10), (x + 10), 120, x(x - 10), 4500, (1540 ×  x), ? Also, 'x' = positive root of x2 - 6x - 720 = 0Solution
Given, x2 - 6x - 720 = 0 Or, x2 - 30x + 24x - 720 = 0 Or, x(x - 30) + 24(x - 30) = 0 Or, (x - 30)(x + 24) = 0 So, x = 30 or x = -24 So, x = 30 So, (x - 10) = 20 (x + 10) = 40 (x - 10) × x = 20 × 30 = 600 (1540 × x) = 1540 × 30 = 46200 So, the series becomes: 20, 40, 120, 600, 4500, 46200, ? The series follows the pattern as: 20 × 2 = 40 40 × 3 = 120 120 × 5 = 600 600 × 7 = 4200 4200 × 11 = 46200 So, 4200 should come in place of 4500. And, ? = 46200 × 13 = 600600 Or, 600600 ÷ 30 = (20020 × x)
What approximate value will replace the question mark (?) in the following?
√25...
Find the approximate value of Question mark(?). There is no requirement to find the exact value.
(2999.77 ÷ 74.85) + (√624.95 × 4.09) = ?
...25.11% of 239.99 + √143.97 ÷ 12.02 = ?
28.01% of 3650 + 40.10% of 150 – 301.75 = ?
The interest received by investing Rs. 1200 for 2 years at compound interest of 20% p.a., compounded annually, was re-invested for 3 years at simple int...
(363.89% of 224.98 – 319.86% of 134.94) ÷ ? = √(134.88 ÷ 15.25)
179.89 + 17.04² + ?³ = √783.97 * 29.09
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.)...
74.856% of 639.98 - 15.098 of √145 = ? of 14.972
A man must travel 600 km in 12 hours. If he traveled the first 40% of the journey at a constant speed of 80 km/h, at what speed must he travel the remai...
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