The area of a circle of radius √2 is approximately-
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The sum of the present ages of a father and his son is 60 years. Five years ago, father's age was four times the age of the son. So now the son's age will be -

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A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is?

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A cylindrical rod of iron, whose height is equal to its radius, is melted and cast into spherical balls whose radius is half the radius of the rod . Find the number of balls.

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A person's present age is two-fifth of the age of his mother. After 8 years , he will be one- half of the age of his mother . How old is the mother at present ?

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