TCS Papers: Sample Questions 91 - 93 of 502

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Question number: 91

» Aptitude

MCQ▾

Question

A is 20 percent more efficient than B. If two persons can complete a piece of work in 60 days then in how many days A working alone can complete the work?

Choices

Choice (4) Response

a.

100

b.

90

c.

80

d.

110

Answer

d.

Explanation

  • A is 20 % more efficient than B.
  • If B’s per day work is 100 units then A’s per day work will be 120.
  • Both persons together complete a day.
  • If they work together, they will take 60 days to complete the work. So total work = 60 x 220
  • We are asked to find the number of days to complete the work when A alone is working, which will be
  • So, A alone will take 110 days to complete the work.

Question number: 92

» Aptitude

MCQ▾

Question

If a man can swim downstream at 6kmph and upstream at 2kmph, his speed in still water is:

Choices

Choice (4) Response

a.

2.5kmph

b.

2kmph

c.

3kmph

d.

4kmph

Answer

d.

Explanation

  • Let the speed of man in still water is u kmph.
  • Downstream speed means person is swimming in the direction of water and upstream speed means person is swimming in the opposite direction of flowing water.
  • Downstream speed, a = 6 kmph and upstream speed, b = 2 kmph
  • Speed of man, u = (a + b) /2

u = (6 + 2) /2

u = 4 kmph

  • Man’s speed will be 4 kmph in still water.

Question number: 93

» Aptitude

MCQ▾

Question

A sporting goods store ordered an equal number of white and yellow balls. The tennis ball company delivered 45 extra white balls, making the ratio of white balls to yellow balls 1/5: 1/6. How many white tennis balls did the store originally order for?

Choices

Choice (4) Response

a.

225

b.

450

c.

270

d.

None of the above

Answer

a.

Explanation

Sporting goods ordered equal number of white and yellow balls, i. e. in the ratio of

Company delivered 45 extra while balls, making ratio of white balls to yellow balls

So, we can say that after 45 more white balls ratio has changed from to .

So, 225 white tennis balls were ordered originally.