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Q:

A woman suffered 20% loss on first investment and made 10% profit at second investment and 12 ½% profit on the third investment. If the invested amount be in the ratio of 4 : 5 : 3, find her profit percentage?

A) 0.625% B) 1.205%
C) 0.987% D) 0%
 
Answer & Explanation Answer: A) 0.625%

Explanation:

From the given data,

let the amounts invested be 4p, 5p and 3p

Net profit = Total profit - Total loss

= 10x5p/100 + 25x3p/200 - 20x4p/100

= 0.875p - 0.8p

= 0.075p

Therefore, profit% = (Net profit/Total investment) x 100

= 0.075 x 100/12 

= 0.0625%

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Filed Under: Percentage
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Q:

Find the lowest common multiple of 24, 36 and 40?

A) 360 B) 420
C) 240 D) 120
 
Answer & Explanation Answer: A) 360

Explanation:

To find the LCM of 24, 36 and 40

24 = 2 x 2 x 2 x 3

36 = 2 x 2 x 3 x 3

40 = 2 x 2 x 2 x 5 

Now, LCM of 24, 36 and 40 = 2 x 2 x 2 x 3 x 3 x 5

= 8 x 9 x 5

= 72 x 5

= 360

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Filed Under: HCF and LCM
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Q:

What is the age of Teja?

A: Four years ago, Raju was as old as Teja is at present.

B: Sita’s present age is two times of Raju’s present age.

C: The average age of Teja and Sita is 19 years.

A) Any two statements are sufficient to give answer B) Only C is sufficient
C) All of three statements are necessary to give answer D) Even using all the three statements answer cannot be found
 
Answer & Explanation Answer: C) All of three statements are necessary to give answer

Explanation:

From the given statements A, B & C

Let the present age of Teja = P

Raju present age = P + 4

Sita's present age = 2(P + 4)

Average of ages of Sita & Teja = 19

=> (2P + 8 + P)/2 = 19

= 3P + 8 = 38

=> P = 30/3 = 10

Hence, the present age of Teja = P = 10 yrs.

 

Therefore, by using all the three statements A, B & C we can find the age of Teja.

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Filed Under: Problems on Ages
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Q:

Prabhas is twice as good a workman as Rana and finishes a piece of work in 3 hours. In how many hours they together could finish that piece of work?

A) 3 hrs B) 3.5 hrs
C) 2.5 hrs D) 2 hrs
 
Answer & Explanation Answer: D) 2 hrs

Explanation:

Given Prabhas is twice as good a workman as Rana.

Prabhas finishes the work in 3 hrs

=> Rana finishes the work in 6 hrs.

Number of hours required together they could finish the work

= 3 x 6 / 3 + 6

= 18/9

= 2 hrs.

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Filed Under: Time and Work
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Q:

Unlike eutherians, both monotremes and marsupials

A) have some embryonic development outside the uterus B) are found in Australia
C) lay eggs D) lack nipples
 
Answer & Explanation Answer: A) have some embryonic development outside the uterus

Explanation:
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Filed Under: Biology
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Q:

Most organic compounds contain carbon and

A) Hydrogen B) Nitrogen
C) Potassium D) All of the above
 
Answer & Explanation Answer: A) Hydrogen

Explanation:

Most organic compounds contain carbon and hydrogen.

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Filed Under: General Science
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Q:

What is the term for classifying and grouping organisms?

A) Homology B) Taxonomy
C) Biology D) Zeology
 
Answer & Explanation Answer: B) Taxonomy

Explanation:

The term for classifying and grouping organisms is Taxonomy. It is the science of defining and naming groups of biological organisms on the basis of shared characteristics.

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Filed Under: General Science
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Q:

Demand is said to be inelastic when

A) Percentage change in demand is less than the percentage change in price of the good B) Percentage change in demand is greater than the percentage change in price of the good
C) Percentage change in demand is equal to the percentage change in price of the good D) None of the above
 
Answer & Explanation Answer: A) Percentage change in demand is less than the percentage change in price of the good

Explanation:

Demand is said to be inelastic, when the demand for the good doesn't change much or it is negotiable when the price of the good changed.

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Filed Under: Finance
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