Question
The ratio of the present ages of ‘A’ and ‘B’ is
7:6, respectively. Two years hence from now, the age of ‘B’ will be 20 years. If the average of present ages of ‘A’, ‘B’ and ‘C’ is 21 years, then find the present age of ‘C’.Solution
Let the present ages of ‘A’ and ‘B’ be 7x years and 6x years, respectively Therefore, 6x + 2 = 20 Or, 6x = 18 Or, x = 3 Sum of present ages of ‘A’ and ‘B’ = 7x + 6x = 39 years Sum of present ages of ‘A’, 'B’ and ‘C’ = 21 × 3 = 63 years Therefore, present age of ‘C’ = 63 – 39 = 24 years
Find the wrong number in the given number series.
8, 16, 24, 32, 32, 64
121Â Â Â Â Â 127Â Â Â Â Â Â 133Â Â Â Â Â Â 142Â Â Â Â Â Â 160Â Â Â Â Â Â 206
...Find the wrong number in given number series.
6490, 6377, 6294, 6211, 6138
11Â Â Â Â Â 29Â Â Â Â Â Â 45Â Â Â Â Â 59 Â Â Â Â Â Â 70 Â Â Â Â Â Â Â 81
...Find the wrong number in given number series.
2482, 2507, 2607, 2842, 3232, 3857
96, 480, 120, 360, 150, 750
4, 5, 12, 39, 160, 806
 7    12     33    126    635  Â
Find the wrong number in the given number series.
2, 3, 5, 7, 11, 13, 17, 2011, 1341, 3070, 5267, 8011, 11386