Question
In two years, the grandson's age will be one-quarter of
the grandfather's age. Three years ago, the grandfather was five times as old as the grandson. Determine the grandson's current age.Solution
3 years ago from now, let the age of the grandson and that of the grandfather be 'y' years and '5y' years, respectively 2 years hence from now, age of the grandfather = 5y + 3 + 2 = (5y + 5) years 2 years hence from now, age of the grandson = y + 3 + 2 = (y + 5) years According to the question, (5y + 5) = (y + 5) ÷ 0.25 Or, 5y + 5 = 4y + 20 So, y = 15 So, present age of the grandson = 15 + 3 = 18 years
What will come in place of the question mark (?) in the following series?
24, 8, 15, ?, 12, 4
√(10198 )× √(7220 )÷ 16.69 + 2010.375= ?
5, 5, 15, 75, ?, 4725
What value should come in the place of (?) in the following number series?
4, 10, 22, 46, ?, 190
What will come in place of the question mark (?) in the following series?
206, 187, ?, 157, 146, 139
24, 35, 48, 65, 84, 107
Find the missing term in the series:
3, 8, 19, 42, 89, ?
- What will come in place of (?) in the given number series.
2, 6, 15, 31, 56, ? 625, 125, 375, 75, 225, 45, ?
4    9    28    99    ?   2105   12660
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