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The mean of 5 observations is 10. If each observation is increased by 2, what is the new mean?

A10

B12

C14

D20

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Find the volume of a sphere with radius 3 cm.

A27pi

B36pi

C48pi

D54pi

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Solve for x: 2^(x+3) = 32.

A1

B2

C3

D4

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A man buys 5 pens for Rs. 20 and sells 4 pens for Rs. 20. Find his profit percentage.

A20%

B25%

C30%

D40%

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If 30% of a number is 60, what is 40% of the number?

A70

B80

C90

D100

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What is the unit digit of 7^105?

A1

B3

C7

D9

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Simplify: (x^3 – y^3) / (x – y).

Ax^2 - y^2

Bx^2 + xy + y^2

Cx^2 - xy + y^2

Dx^2 + y^2

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A bag contains 6 red and 4 blue balls. If two balls are picked, what is the probability that both are red?

A1/3

B1/2

C1/4

D1/5

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If x + 1/x = 4, find x^2 + 1/x^2.

A12

B14

C16

D18

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If A and B can do a piece of work in 8 days and B alone can do it in 12 days, how long will A take?

A16 days

B20 days

C24 days

D30 days

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