Quantitative Aptitude - Arithmetic Ability Questions

Q:

Which of the following is correct?

A) (4x - 5y)2 = 16x2 - 20xy + 25y2 B) (4x - 5y)2 = 16x2 + 40xy - 25y2
C) (4x - 5y)2 = 16x2  - 40xy + 25y2 D) (4x - 5y)2  = 16x2 - 20xy - 25y2
 
Answer & Explanation Answer: C) (4x - 5y)2 = 16x2  - 40xy + 25y2

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Filed Under: Simplification
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Q:

If 2x+4-2x+2=3, then the value of x?

A) 0 B) 2
C) -1 D) -2
 
Answer & Explanation Answer: D) -2

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Q:

The price of an article is cut by 42%, to restore to its original value, the new price must he increased by ______.

A) 42 percent B) 72.41 percent
C) 29.58 percent D) 52.5 percent
 
Answer & Explanation Answer: B) 72.41 percent

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Filed Under: Percentage
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Q:

Three numbers are in the ratio of 3:5:10 and their LCM is 630. Find their HCF.

A) 21 B) 42
C) 63 D) 36
 
Answer & Explanation Answer: A) 21

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Filed Under: HCF and LCM
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Q:

If the elevation of the Sun changes from 30° to 60° , then the difference between the lengths of shadows of a pole 15 m high, is

A) 7.5 m B) 15 m
C) 10√3 m D) 5√3 m
 
Answer & Explanation Answer: C) 10√3 m

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Filed Under: Height and Distance
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Q:

In an isosceles ΔABC, AD is the median to the unequal side meeting BC at D. DP is the angle disector of ∠ADB and PQ is drawn parallel to BC meeting AC at Q. Then the measure of ∠PDQ is

A) 130° B) 90°
C) 180° D) 45°
 
Answer & Explanation Answer: B) 90°

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Filed Under: Volume and Surface Area
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Q:

The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years the ratio of their ages will be 10:9. What is Ratna's present age?

A) 19 B) 15
C) 9 D) 72
 
Answer & Explanation Answer: A) 19

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Filed Under: Problems on Ages
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Q:

When a number is increased by 105, it becomes 135% of itself. What is the number?

A) 450 B) 300
C) 600 D) 400
 
Answer & Explanation Answer: B) 300

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Filed Under: Percentage
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