The average age of husband and wife, who were married 5 years ago, was 22 years at the time of their mariage. Now the average age of family including husband, wife and a child (born during the interval) is 19 years. What is the present age of child?

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2 .

The radius of the driving wheel of a bus is 35 cm. How many revolutions per minute must the wheel make in order to keep a speed of 33 km/hr ?

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3 .

The survey of daily incomes of the familes of a locality.

How many families are surveyed?

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4 .

The survey of daily incomes of the familes of a locality.

The number of families, whose daily incomes are Rs. 1200 or above Rs. 1200, is

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5 .

The survey of daily incomes of the familes of a locality.

The number of families, whose daily incomes are Rs. 700 or below Rs. 700, is

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6 .

The survey of daily incomes of the familes of a locality.

The number of families, whose daily incomes are more than Rs.800 but less than Rs. 1100, is

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7 .

The survey of daily incomes of the familes of a locality.

What percent of families have their daily incomes Rs. 800 or less than Rs. 800?

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8 .

The value of $(16)^ {0.31}$ $\times$ $(4)^ {1.38}$ $\times$ $2^ 3 $ is

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9 .

If A = $6 \over 7$ , B = $7 \over 9$, C = $2 \over 5$ and D = $1 \over 8$, then which of the following is true ?

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10 .

Four consecutive positive even numbers are such that thrice the first number is equal to twice the fourth number, then the third number is

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