Aptitude Practice Question and Answer

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Answer : 2. "80.11 percent"

Q:

If the population of a town is 12.000 and the population increases at the rate of 10% per annum, then find the population. after 3 years.

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  • 1
    15,972
    Correct
    Wrong
  • 2
    12,200
    Correct
    Wrong
  • 3
    11,200
    Correct
    Wrong
  • 4
    10,200
    Correct
    Wrong
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Answer : 1. "15,972"
Explanation :

To find the population after 3 years given that it increases at a rate of 10% per annum, you can use the formula for exponential growth:

𝑃=𝑃0×(1+𝑟)𝑛P=P0×(1+r)n

Where:

  • 𝑃P = Population after 𝑛n years
  • 𝑃0P0 = Initial population
  • 𝑟r = Rate of increase (in decimal form)
  • 𝑛n = Number of years

Given:

  • 𝑃0=12,000P0=12,000 (Initial population)
  • 𝑟=0.10r=0.10 (10% increase per annum)
  • 𝑛=3n=3 (Number of years)

Substitute these values into the formula:

𝑃=12,000×(1+0.10)3P=12,000×(1+0.10)3

𝑃=12,000×(1.10)3P=12,000×(1.10)3

𝑃=12,000×(1.331)P=12,000×(1.331)

𝑃=15,972P=15,972

So, the population after 3 years would be approximately 15,972.


Q:

Pipes  A and B are emptying pipes and can empty a tank in 6 hours and 16 hours, respectively. C is a filling a pipe. All the three pipes were opened together. They took 80 minutes to empty $$ {5\over 8}th$$ of the tank. Pipe C alone can fill the tank in:

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  • 1
    36 hours
    Correct
    Wrong
  • 2
    42 hours
    Correct
    Wrong
  • 3
    48 hours
    Correct
    Wrong
  • 4
    40 hours
    Correct
    Wrong
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Answer : 3. "48 hours"

Q:

Directions: Given table shows the data of population in 5 different parks. Study the data carefully and answer the questions.

If 30 females from each park are above 80 years age then find the average of no. of females who are below or equal to the age of 80 years from all the parks.

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  • 1
    295
    Correct
    Wrong
  • 2
    285
    Correct
    Wrong
  • 3
    300
    Correct
    Wrong
  • 4
    280
    Correct
    Wrong
  • 5
    290
    Correct
    Wrong
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Answer : 3. "300"

Q:

An article was sold for Rs.4000. Had a discount of 10% was being offered, the profit would have been 20%. The cost price of the article was:

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  • 1
    Rs.3000
    Correct
    Wrong
  • 2
    Rs.3600
    Correct
    Wrong
  • 3
    Rs. 3200
    Correct
    Wrong
  • 4
    Rs. 3310
    Correct
    Wrong
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Answer : 1. "Rs.3000"

Q:

The expenses on rice, fish and oil of a family are in the ratio 12 : 17 : 3. The price of these articles are increased by 20 % , 30 % and 50 % respectively. The total expenses of family on these articles are increased by: 

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  • 1
    $$28{1\over 8}\%$$
    Correct
    Wrong
  • 2
    $$30{1\over 8}\%$$
    Correct
    Wrong
  • 3
    $$14{1\over 8}\%$$
    Correct
    Wrong
  • 4
    $$7{1\over 8}\%$$
    Correct
    Wrong
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Answer : 1. "$$28{1\over 8}\%$$"

Q:

In an examination, 93% of students passed and 252 failed. The total number of students appearing at the examination was:

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  • 1
    4200
    Correct
    Wrong
  • 2
    3850
    Correct
    Wrong
  • 3
    3950
    Correct
    Wrong
  • 4
    3600
    Correct
    Wrong
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Answer : 4. "3600"

Q:

The marked price of an article is 10 % higher than cost price. A discount of 10 % is given on marked price. In this kind of sale, the seller bears: 

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  • 1
    no loss no gain
    Correct
    Wrong
  • 2
    a loss of 5 %
    Correct
    Wrong
  • 3
    again of 1 %
    Correct
    Wrong
  • 4
    a loss of 1 %
    Correct
    Wrong
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Answer : 4. "a loss of 1 % "

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