Question
The ratio of age of Rahul 7 years ago to the age of Neha
7 years hence is 3:4. If the average of their present ages is 35 years, what is the difference between their present ages?Solution
ATQ Let the present age of Rahul and Neha be ‘r’ years and ‘n’ years, respectively. So, (r – 7) / (n + 7) = 3 / 4 Or, 4r – 28 = 3n + 21 Or, 4r – 3n = 49 ------------------ (1) Also, r + n = 2 × 35 = 70--------------- (2) Equation (2) × 3 + Equation (1), we get 7r = 259 Or, r = 37 So, n = 70 – 37 = 33 Required difference = 37 – 33 = 4 years
If the first term of the arithmetic progression is 18, the common difference is 5, and the number of terms in the series are 40, then find the sum of th...
73920, 9240, ?, 220, 44, 11
If 2, 7, 20, x , 110, 235,
Then, 7 x + 7√x = ?
53 ? 55 49 57 47
...45 47 97 296 ? 5966
8 9 22 75 316 ?
...If 4 x 4 7 15 38.5
Then, ( x + 1) ( x - 1) = ?
...D irection: Which of the following will replace ‘?’ in the following series
460, 462, ‘?’, 467.5, 470.97
...If 152, 242, x , 332, 404, 314,
then find the value of (2x – 1)?
...24, 33, 50, ?, 108, 149
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