Question
The ratio of the ages of A and B is 3:5. After 5 years,
the ratio will be 7:11. Find the present age of B.Solution
Let the present ages of A and B be 3x and 5x, respectively. After 5 years, the ages will be 3x + 5 and 5x + 5. The new ratio is given as (3x + 5) / (5x + 5) = 7/11. Cross-multiply: 11(3x + 5) = 7(5x + 5) 33x + 55 = 35x + 35 2x = 20 x = 10 Now, the present age of B = 5x = 5 × 10 = 50
11, 12, 16, 25, ?, 66
14 26 ? 558 4432 44270
...30 29 91 446 ? 28217
61 71 86 ? 131 161
...140Â Â Â Â 300Â Â Â Â 380Â Â Â Â Â 420Â Â Â Â Â 440Â Â Â Â Â ?
...14, 28, 54, 98, 154, 224
5Â Â Â Â Â Â Â Â Â 18Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 44Â Â Â Â Â Â Â Â Â Â Â 83Â Â Â Â Â Â Â Â Â 135Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 200Â Â Â Â ...
19 8 ? -14 63 - 36
...If  7     43    x     1311    5247       15739
Then, x - x/2 + 2 = ?
...3720 3842 ? 4092 4220 4350
...
