# HCL Placement: Sample Questions 19 - 21 of 57

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## Question 19

### Write in Short

If a = 2, b = 3, c = 6 then find the value of

### Explanation

• Here, a = 2, b = 3, c = 6
• Let first term =
• Substituting the values of a, b and c

• Second term =
• Substituting the values of a, b and c

• Subtracting both the terms,

=

• Taking LCM of 5 and 6, i.e.. 30

• Value of is .

## Question 20

### Question

MCQ▾

A trader bought 10kg of apples for ₹ 405 out of which 1kg of apples was found to be rotten. If he wishes to make a profit of 10 % , at what rate should he sell the remaining apples per kg?

Choice (4)

a.

₹ 45

b.

₹ 50

c.

₹ 51

d.

₹ 49.50

a.

### Explanation

• Trader bought 10 kg of apples for ₹ 405.
• So, cost of one kg of apple is = 40.5
• Trader wants to make 10 % profit then he should sell the remaining apples at rate SP,
• SP =
• SP =
• SP = 44.55
• So, to make 10 % profit, trader should sell one kg of apple at ₹ 44 .

## Question 21

### Question

MCQ▾

HCL prototyping machine can make 10 copies every 4 seconds. At this rate, how many copies can the machine make in 6 minutes?

Choice (4)

a.

360

b.

900

c.

600

d.

240

b.

### Explanation

• 1 minute = 60 seconds
• 6 minutes = seconds

= 360 seconds

• In 4 seconds HCL prototype machine can make 10 copies
• Then in 360 seconds HCL prototype machine makes x copies

• HCL prototype can make 900 copies in 6 minutes.

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