Question
Ratio of ages of father and son is 3 : 1. The product of
their ages is 147. What is the sum of their ages?Solution
Ratio of ages of father and son is 3: 1. Let their ages be measured in terms of x. The product of their ages is 147. (3x) × (x) = 147 3x2 = 147 X2 = 49 x2=7 Sum of their ages = 3x+x =4x  =4×7 = 28years
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
