# WIPRO PREVIOUS PLACEMENT QUESTIONS – 7

# WIPRO PREVIOUS PLACEMENT QUESTIONS – 7

a. p

b. q

c. r

d. data inadequate

Answer: b

Explanation:

Let the total work be 280 units.

Now P and Q capacity per day = 280/10 = 28 units.

Q and R capacity per day =280/14 = 20 units

P and R capacity per day = 280/8 = 25 units.

Adding all the three,

2(P + Q + R) = 73 ⇒ P + Q + R = 36.5 units.

We are asked to find who will take maximum time. So the capacity is minimum. R capacity is minimum as (P + Q + R) – (P + R) = 36.5 – 28 = 8.5.

Explanation:

It is clear that if Josh debates for Rosln, Manchester wins. So Option A is correct.

Answer: b

Explanation:

Explanation:

Let the first amount lent for t + 2 years and second at t years. and amount = P

Now amount = P + P×t×6100P×t×6100 = P×(t+2)×5100P×(t+2)×5100 = 2800.

Equating first two parts, we get t×6100=(t+2)×5100t×6100=(t+2)×5100

⇒ t = 10.

Now P+P×10×6100=2800P+P×10×6100=2800

⇒ 1610P=28001610P=2800

⇒ P = 1750.

Explanation:

Let B joined with investment x. And he invested for 12 – 5 = 7 months.

Answer: d

Explanation:

Rajan is in the business for 12 months, Rakesh is for 4, and Mukesh is for 8.

Explanation:

Strap should cover two walls of the given parameter.

(a)1

(b)4

(c)16

(d)64

(e)128

Answer: d

Explanation:

Here king can be selected in 4C1 ways

And other is queen & jack are also selected in the same way.

So 4C1 × 4C1 × 4C1 = 4 × 4 × 4 = 64

a. 5

b. 7

c. 10

d. 12

Answer: b

Explanation:

Let the number of cows be x and hens be y.

So heads = x + y

Legs = 4x + 2y

Now

⇒ 4x + 2y = 2(x + y) + 14

⇒2x = 14

⇒ x = 7.

10.

1 = 5

2 = 10

3 = 15

4 = 20

5 = ?

Answer: 1

Explanation:

Answer is “1” as 1 = 5

Then 5 should be 1.

11. If six persons sit around a table, the probability that some specified three of them are always together is

a)1/20

b)3/10

c)1/5

d)4/5

Answer: b

Explanation:

Let us group those 3 persons into one. Now 4 elements can be arranged in a circle in (4 – 1)! ways. Now those three persons in that group can arrange themselves in 3! ways. So total ways = 3! × 3!.

Total ways of arranging 6 persons around a circle = (6-1)!.

Probability = 3!×3!5!3!×3!5! = 310310

12. Out of four numbers ,the average of first three is 16 and that of the last three is 15 .If the last number is 18,the first number is :

A) 20

B) 21

C) 23

D) 25

Answer: b

Explanation:

Let the numbers be a, b, c, d

From the 1st condition, Sum of the first three numbers = a + b + c = 16 × 3 = 48

In the 2nd condition, b + c + d = 45

Now,d is given value as 18

thus, b + c + 18 = 45

b + c = 27

Putting the value of b + c in equation, a + b + c = 48

⇒ a + 27 = 48

⇒ a = 21

13. Mr. X has to build a wall 1000 meters long in 50 days. He employs 56 men but at the end of 27 days finds that only 448 meters are built. How many more men must be employed so that the work may be finished in time?

a)58

b)81

c)38

d)25

Answer: d

Explanation:

Initially Mr.X over estimated the capacity of the workers. Infact, 56 men built 448 meters in 27 days. So our problem is to find How many men can built 552 meters in 23 days. Use chain rule.

Required number of men = 56×552448×272356×552448×2723 = 81

14. In a race you drove 1st lap with 40 kmph and in the second lap at what speed you must drive so that your average speed must be 80 kmph.

Answer: Infinity

Explanation:

Infinite speed.

Let distance of lap be d km.

Total distance = 2d km.

Time for first lap = d/40 kmph and that for second lap = d/x kmph, where x is requied speed.

Average speed = (total distance)/ (total time)

⇒ 2d/(d/40+d/x)

⇒ 2/(1/40+1/x).

Given this is equal to 80.

So, 2/(1/40+1/x) = 80

2 = 2 + 80/x.

Which means 80/x = 0.

For that x must be equal to infinity.

15. A and B working separately can do a piece of work in 6 and 9 days respectively; they work on alternate days starting with A on the first day. In how many days will the work be done?

Answer: 7

Explanation:

B = 1/9 days

With A starting the work

In a period of 2 days work done by a and b = 1/6 + 1/9 = 5/18

In 3 such periods work done = 5/18 + 5/18 +5/18 = 15/18

Remaining work = 1 – 15/18 = 1/6

Now its a turns and it can complete the remaining work

So number of days = 3 × 2 + 1 = 7

16. In a certain office, 72% of the workers prefer tea and 44% prefer coffee. If each of them prefers tea or coffee and 40 like both, the total number of workers in the office is :

a. 200

b. 240

c. 250

d. 320

Answer: c

Explanation:

If the total number of workers is 100 then 72 prefer tea and 44 prefer coffee.

n(Tea ∪ Coffee) = n(Tea) + n(Coffee) – n(Tea ∩ Coffee)

100 = 72 + 44 – x

x = 116 – 100 = 16.

Therefore Out of 100 workers, 16 take both coffee and tea.

But as per the problem 40 take both coffee and tea

100 – – – 16

? – – – – – 40

(40/16) × 100 = 250.

17. P & Q can draw a picture in 144 hours; Q & R can draw a same picture in 240 hours; P & R can finish it in 180 hours. What will be the time taken by P alone to draw the picture?

a) 280 hours

b) 240 hours

c) 200 hours

d) 300 hours

Answer: b

Explanation:

Given that, (P + Q) takes 144 hours; i.e., (P + Q)’s 1 hour’s work = 11441144

(Q + R) takes 240 hours; i.e., (Q + R)’s 1 hour’s work = 12401240

(P + R) takes 180 hours; i.e., (P + R)’s 1 hour’s work = 11801180

Adding above 3, we get,

2(P + Q + R)’s 1 hour’s work = 1144+1240+11801144+1240+1180 = 5+3+47205+3+4720= 1272012720 = 160160

2(P+Q+R)’s 1 hour’s work = 160160

Therefore, (P+Q+R)’s 1 hour’s work = 11201120

Now, P’s 1 hour’s work = (P+Q+R)’s 1 hour’s work – (Q+R)’s 1 hour’s work

= 11201120 – 12401240 = 12401240

Therefore P alone takes 240 hours.