Question
The ratio of the present ages of ‘A’ and ‘B’ is
5:7, respectively. Three years hence from now, the age of ‘B’ will be 17 years. If the average of present ages of ‘A’, ‘B’ and ‘C’ is 18 years, then find the present age of ‘C’.Solution
Let the present ages of ‘A’ and ‘B’ be 5x years and 7x years, respectively Therefore, 7x + 3 = 17 Or, 7x = 14 Or, x = 2 Sum of present ages of ‘A’ and ‘B’ = 5x + 7x = 24 years Sum of present ages of ‘A’, “B’ and ‘C’ = 18 × 3 = 54 years Therefore, present age of ‘C’ = 54 – 24 = 30 years
612, 487,?, 396, 388, 387
Find the missing number in the given number series.
1, 2, 6, 24, 120, ?What will come in place of the question mark (?) in the following series?
36, 85, ?, 230, 330, 451
Find the missing term in the series:
2, 5, 11, 23, 47, ?
What will come in place of the question mark (?) in the following series?
400, 841, 1202, ?, 1716, 1885
44   45    41   50    ?      59    23
...221, 100, 0, -81, ?
...900 Â Â Â 90Â Â Â 18Â Â Â ? Â Â Â Â 2.16Â Â Â Â 1.08
16, 20, 11, 27, ?, 38
37, 57, 82, ?, 147, 187
