# Tech Mahindra Placement: Sample Questions 37 - 39 of 42

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## Question 37

Edit

### Write in Short

Sum of money at compound interest amounts thrice itself in 3 years. In how many years will it take 9 times itself?

### Explanation

• For compound interest,

• We are asked to fin number of years when money will be 9 times the original.

• In 6 years, sum will be 9 times the original amount.

## Question 38

### Question

MCQ▾

The price of sugar increases by 20 % , by what % house-wife should reduce the consumption of sugar so that expenditure on sugar can be same as before?

Choice (4)

a.

15 %

b.

16.66 %

c.

9 %

d.

12 %

b.

### Explanation

• If the price of any product gets increased by R % then to reduce the consumption of product so that expenditure does not increase, we need to apply this formula.
• Here, price of sugar gets increased by 20 % . So, house wife should reduce the consumption of sugar so that expenditure on sugar can be same as before by applying,

=

=

= 16.66 %

• House wife should reduce the consumption of sugar by 16.66 % .

## Question 39

### Question

MCQ▾

Complete the following series.

________ , ayw, gec, mki, sqo

Choice (4)

a.

lmn

b.

awx

c.

usq

d.

prs

c.

### Explanation

• Alphabets in series is: a b c d e f g h i j k l m n o p q r s t u v w x y z
• Alphabets in reverse order is: z y x w v u t s r q p o n m l k j i h g f e d c b a
• Second term of the series is ayw, in which we have taken every alternate letter of alphabets to make a term.
• Same way, third term is gec, in which again alternate letters are making a term.
• Same way, fourth term is mki, in which again alternate letters are making a term.
• Same way, fifth term is sqo, in which again alternate letters are making a term.
• Applying the same analogy, first term will be usq from the reverse alphabetical series.

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