Question
The ratio of the present ages of father and his son is
5:2. The product of their ages 4 years ago was 31 times of his son’s age that year. What was son’s age 2 year ago?Solution
Let present age of father and son be 5x and 2x respectively. According to question, => (5x – 4) (2x – 4) = 31 × (2x – 4) => (5x – 4) = 31 => 5x = 35 => x = 7 Therefore, son’s age 2 years ago = (2x – 2) = 12 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
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