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 Quantitative Aptitude - Arithmetic Ability Questions

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Q:

A Contractor employed a certain number of workers  to finish constructing a road in a certain scheduled time. Sometime later, when a part of work had been completed, he realised that the work would get delayed by three-fourth of the  scheduled time, so he at once doubled the no of workers and thus he managed to finish the road on the scheduled time. How much work he had been completed, before increasing the number of workers?

A) 10 % B) 14 ( 2/7 )%
C) 20 % D) Can't be determined
 
Answer & Explanation Answer: B) 14 ( 2/7 )%

Explanation:

Let he initially employed x workers which works for D days and he estimated 100 days for the whole work and then he doubled the worker for (100-D) days.

D * x +(100- D) * 2x= 175x 

=>  D= 25 days 

Now , the work done in 25 days = 25x 

Total work = 175x

Therefore, workdone before increasing the no of workers = 25x175x×100 % = 1427%

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Filed Under: Time and Work

107 32213
Q:

If A : B = 2 : 3 and B : C = 4 : 5, then what is (A + C) : B?

 

A) 8 : 5 B) 7 : 3
C) 23 : 12 D) 25 : 14
 
Answer & Explanation Answer: C) 23 : 12

Explanation:
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Filed Under: Ratios and Proportions
Exam Prep: Bank Exams

4 32206
Q:

A shopkeeper offers the following 3 schemes. Which scheme has the maximum discount percentage?

 

I. Two successive discounts of 30% and 20%

 

II. Buy 4 get 7

 

III. Buy 4 get 3 free

 

A) Only I B) Only III  
C) Only II and III   D) All are equal
 
Answer & Explanation Answer: A) Only I

Explanation:
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Filed Under: Percentage
Exam Prep: Bank Exams

1 32197
Q:

Select the odd number from the given alternatives.

 

A) 25 B) 49
C) 9 D) 8
 
Answer & Explanation Answer: D) 8

Explanation:
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Filed Under: Odd Man Out
Exam Prep: Bank Exams

0 32169
Q:

Select the figure that does NOT belong in the following group.

 

 

A) B B) D
C) C D) A
 
Answer & Explanation Answer: C) C

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Filed Under: Odd Man Out
Exam Prep: Bank Exams

0 32137
Q:

Akash leaves mumbai at 6 am and reaches Bangalore  at  10 am . Prakash leaves Bangalore at 8 am and reaches Mumbai at 11:30 am. At what time do they cross each other?

A) 10 am B) 8:32 am
C) 8:56 am D) 9:20 am
 
Answer & Explanation Answer: C) 8:56 am

Explanation:

Time taken by Akash = 4 h

Time taken by Prakash = 3.5 h

For your convenience take the product of times taken by both as a distance.

Then  the distance = 14km

Since, Akash covers half of the distance  in 2 hours(i.e at 8 am)

Now, the rest half (i.e 7 km) will be coverd by both prakash and akash

Time taken by them = 7/7.5 = 56 min

Thus , they will cross each other at  8 : 56am.

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Filed Under: Time and Distance

71 32014
Q:

A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family ?

A) 31( 5/7) B) 32 (6/7)
C) 34(4/7) D) 35(4/9)
 
Answer & Explanation Answer: A) 31( 5/7)

Explanation:

Required average = (67 * 2 + 35 * 2 + 6 * 3) / (2 + 2 + 3)

                           = (134 + 70 + 18) / 7  =  222 / 7 = 31(5/7) years.

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Filed Under: Average

13 31976
Q:

In the following question,select the missing number from the given alternatives.

7, 26, ?, 124, 215, 342

A) 63 B) 65
C) 66 D) 67
 
Answer & Explanation Answer: A) 63

Explanation:
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Filed Under: Odd Man Out
Exam Prep: Bank Exams

0 31933