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The average of 100 items was found to be 30 . If at the time of calculation , two items were wrongly taken as 32 and 12 instead of 23 and 11 , then the correct average is

A) 29.8	B) 29
C) 29.9	D) 29.5

A) 29.8

B) 29

C) 29.9

D) 29.5

Answer & Explanation Answer: C) 29.9

Explanation:

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Filed Under: Average
Exam Prep: Bank Exams

Among three numbers , second is twice the first and also thrice the third . If the average of the three numbers is 33 , then the largest number is

A) 36	B) 54
C) 62	D) 72

A) 36

B) 54

C) 62

D) 72

Answer & Explanation Answer: B) 54

Explanation:

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Filed Under: Problems on Numbers
Exam Prep: Bank Exams

The value of tan 315° cot ( -405° ) is equal to

A) -1	B) 1
C) 0	D) 2

A) -1

B) 1

C) 0

D) 2

Answer & Explanation Answer: B) 1

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Filed Under: Simplification
Exam Prep: Bank Exams

If PQ and PR be the two tangents to a circle with centre O such that ∠QPR = 120° then ∠POQ is

A) 90°	B) 45°
C) 30°	D) 60°

A) 90°

B) 45°

C) 30°

D) 60°

Answer & Explanation Answer: C) 30°

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Filed Under: Volume and Surface Area
Exam Prep: Bank Exams

If xy+yz+zx = 1, then the value of $\frac{(1 + y^{2})}{(x + y) (y + z)}$ ?

A) 2	B) 3
C) 4	D) 1

A) 2

B) 3

C) 4

D) 1

Answer & Explanation Answer: D) 1

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Filed Under: Simplification
Exam Prep: Bank Exams

If $x = {at}^{2}$ and y = 2at then

A) x2 = 4ay	B) y2 = 4ax
C) x2 + y 2 = a2	D) x 2 - y2 = a 2

A) x2 = 4ay

B) y2 = 4ax

C) x2 + y 2 = a2

D) x 2 - y2 = a 2

Answer & Explanation Answer: B) y2 = 4ax

Explanation:

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Filed Under: Simplification
Exam Prep: Bank Exams

A train 110 metres long is running with a speed of 60 kmph . In what time will it pass a man who is running at 6 kmph in the direction opposite to that in which the train is going ?