Quantitative Aptitude - Arithmetic Ability Questions

Q:

Product of 9b2, 3a2 and 4ab is

A) 108a2b2 B) 108a3b3
C) 108a3b2 D) 108a4b4
 
Answer & Explanation Answer: B) 108a3b3

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Q:

A can do 1/3rd of a work in 5 days and B can do 2/5th of this work in 10 days. Both A and B, together can do the work in

A) 7 3/8 days B) 8 4/5 days
C) 9 3/8 days D) 10 days
 
Answer & Explanation Answer: C) 9 3/8 days

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Q:

The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?

A) 10 B) 11
C) 12 D) 13
 
Answer & Explanation Answer: C) 12

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Q:

If a is positive and a2+1a2 = 7, then a3 + 1a3 = ?

A) 9 B) 27
C) 18 D) 0
 
Answer & Explanation Answer: C) 18

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Q:

A car travels a certain distance at 34 km/h and comes back at 66 km/h. What is the average speed for total journey?

A) 50 km/hr B) 39.76 km/hr
C) 55.12 km/hr D) 44.88 km/hr
 
Answer & Explanation Answer: D) 44.88 km/hr

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Q:

From an external point two tangents to a circle are drawn. The chord passing through the points of contact subtends an angle72° at the centre. The angle between the tangents is?

A) 36° B) 72°
C) 108° D) 144°
 
Answer & Explanation Answer: C) 108°

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Q:

What is the value of (cos45° + 1/3) ?

A) 2+√3 B) (2√2+1)/√2
C) (3+√2)/3√2 D) 5/√3
 
Answer & Explanation Answer: C) (3+√2)/3√2

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Q:

Expand and simplify (3x + 2)2*(4x -­ 3) -­ (2x3 - 9x2 + 12x -­ 24)

A) 34x3 + 30x2 -­ 32x -­ 12 B) 34x3 + 30x2 -­ 32x + 12
C) 34x3 -­ 30x2 -­ 32x + 12 D) 34x3 -­ 30x2 + 32x -­ 12
 
Answer & Explanation Answer: B) 34x3 + 30x2 -­ 32x + 12

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