Question
The ratio of age of A and B after 8 years is 4:5
respectively. The ratio of age of A and C 6 years ago is 3:4 respectively. If the present average age of A and C is 30 years, then find the present age of C.Solution
Let the age of A and B after 8 years be 4x years. and 5x years respectively. And the present age of C is ‘y’ years. So, (4x – 14)/ (y – 6) = 3/4 16x – 56 = 3y – 18 16x – 3y = 38……………. (1) And 4x – 8 + y = 60 y = 68 – 4x…………………. (2) From equations (1) and (2), we get. 16x – 204 + 12x = 38 28x = 242 x = 8.6 Present age of C = 62 -(4 ×8.6) = 27.6years
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12                          13                         30                     �...
65    69   77 93  ?    189
5 14 56 220 1125 6786
...1 6 13 24 41 ?
17 ? 33 44 57 72
...1, 27, ?, 343, 729, 1331
100Â Â Â 180Â Â Â 294Â Â Â 448Â Â Â 648Â Â Â ?
1400      350       700       175        ?       87.5
...14Â Â 16Â Â Â 20Â Â Â 15Â Â 25Â Â Â Â 13Â Â Â 29Â Â Â 9Â Â Â 32Â Â Â 6
...
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