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2 .After 10 years A will be twice as old as B was 10 years ago. If A is now 9 years older than B, then the present age of B is â€“

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3 .What is the annual instalment to discharge a debt of ` 2210 due in 4 years at 7% simple interest ?

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4 .

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5 .

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6 .A and B together can complete a work in 3 days. They started together but after 2 days, B l ef t the work. I f the work is completed after 2 more days. B alone could do the work in how many days ?

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7 .Two ci rc l es of radii 4 cm and 9 c m respectively, touch each other externally at a point and a common tangent touches them at the points P and Q respectively. Then the area of a square with the side PQ is â€“

A.144 $cm^2$

B.194 $cm^2$

C.169 $cm^2$

D.9 $cm^2$

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8 .Two guns were fired from the same place at an interval of 5 min but a man sitting in a train moving towards that place heard the second sound at an interval of 4 min 30 sec. Find speed of train. (speed of sound = 330 m/sec)

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9 .

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10 .

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