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Placement Questions & Answers :: TCS

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Not Attempted

421. 7^1+7^2+7^3+.......+7^205. Find out how many numbers present which unit place contain 3?

Explanation:

Units digits of first 4 terms are 7, 9, 3, 1. and this pattern repeats.
So for every 4 terms we get one term with 3 in its unit digit.
So there are total of 205/4 = 51 sets and each set contains one terms with 3 in its unit digit.

Tags: TCS

Not Attempted

422. If two-third of a bucket is filled in one minute then the time taken to fill the bucket completely will be .

Explanation:

If two-third of a bucket is filled in one minute
So, time taken to fill the bucket completely = 60*3/2= 90 seconds

Tags: TCS

Not Attempted

423. If a ladder is 100 m long and distance between bottom of ladder and wall is 60 m. What is the maximum size of cube that can be placed between the ladder and wall.

Explanation:

8/6 = tan(y)
x/6*10 -x =tan(y)

8/6=x/60-x
x=34.28

Tags: TCS

Not Attempted

424. 7,77,777,7777,77777,777777....
Find last 3 digits of sum of first 26 terms

Explanation:

At unit digit 7 would be coming 26 timing
so, 26*7=182.
2 at unit place
Then 25*7=175+ (18 carry)=193
Then 24*7=187
So, Last digits will be 732.,

Tags: TCS

Not Attempted

425. If 12 monkeys take 12 minutes to eat 12 bananas. How many monkeys would it take to eat 72 bananas in 72 minutes?

Explanation:

One monkey takes 12 min to eat 1 banana.
So, in 72 mins 1 monkey will eat 6 bananas
For 72 bananas in 72 min we need 72/6 = 12 monkeys

Tags: TCS

Not Attempted

426. Eesha has a wheat business. She purchases wheat from a local wholesaler of a particular cost per pound. The price of the wheat of her stores is \$3 per kg. Her faulty spring balance reads 0.9 kg for a KG. Also in the festival season, she gives a 10% discount on the wheat. She found that she made neither a profit nor a loss in the festival season. At what price did Eesha purchase the wheat from the wholesaler?

Explanation:

Faulty spring balance reads 0.9 kg for a kg" means that she sells 1 kg for the price of 0.9 kgs,
so she looses 10% of the price because of the faulty spring balance. She looses another 10% because of the discount.
So, she actually sells 1 kg for \$3)0.9*0.9=\$2.43 and since at that price she made neither a profit nor a loss,
Then Eesha purchase the wheat from the wholesaler for \$2.43.

Tags: TCS

Not Attempted

427. University of Vikramsila has enrolled nine PhD candidates. Babu, Chitra, Dheeraj , Eesha, Farooq,Gowri , Hameed, Iqbal, Jacob.

-Farooq and Iqbal were enrolled on the same day as each other, and no one else was enrolled that day. -Chitra and gowri were enrolled on the same day as each other, and no one else was enrolled that day. -On each of the other days of hiring , exactly one candidate was enrolled.

-Eesha was enrolled before Babu. -Hameed was enrolled before Dheeraj

-Dheeraj was enrolled after Iqbal but before Eesha -Gowri was enrolled after both Jacob and Babu -Babu was enrolled before Jacob

Who were the last two candidates to be enrolled?

Explanation:

Given:

1. Easha < Babu
2. Hameed < Dheeraj
3. Iqbal < Dheeraj < Easha
4. Jacob/Babu < Gowri
5. Babu < Jacob

From 1 and 5, Easha was before Babu and Jacob so she cannot be in the last two.
Option B ruled out from 4 and 5, babu is before Jacob and Gowri so he cannot be in the last two.
Options a, c ruled out. So option d is correct.

Tags: TCS

Not Attempted

428. A bag contains 1100 tickets numbered 1, 2, 3, ... 1100. If a ticket is drawn out of it at random, what is the probability that the ticket drawn has the digit 2 appearing on it?

Explanation:

Numbers which dont have 2 from 1 to 9 = 8 Numbers which dont have 2 from 10 to 99:

Let us take two places _ _. Now left most place is fixed in 8 ways. Units place is filled with 9 ways. Total 72 numbres.

Numbers which dont have 2 from 100 to 999 =_ _ _ = 8 * 9 * 9 = 648 Numbers which dont have 2 from 1000 to 1099 =10_ _ = 9 * 9 = 81 Finally 1100 does not have 2. So 1.

Total number with no 2 in them = 8 + 72 + 648 + 81 + 1= 810 Tickets with 2 in them = 1100 - 810 = 290

Required probability = 290 / 1100

Tags: TCS

Not Attempted

429. problemsolvingproblemsolvingprob . . . . . . Find the 2015th term in the series?

Explanation:

Problemsolving = 14 letter word.
So divide 2015 by 14 and find the remainder.
Here remainder is 13.
So, 13th letter in problemsolving is 'n'

Tags: TCS

Not Attempted

430. There are 5 boxes in a cargo. The weight of the 1st box is 200 KG, the weight of the 2nd box is 20% higher than the third box, whose weight is 25% higher than the 1st box weight. The 4th box which weighs 350 KG is 30% lighter than the 5th box. Find the difference in average weight of the 4 heaviest boxes and the four lightest boxes.

Explanation:

Weight of 1st box=200

Weight of 3rd box=(125/100)*200=250 weight of 2nd box=(120/100)*250=300 weight of 4th box =350

Weight of 5th box=(10/7)*350=500

Average of 4 highest weighted Boxes = (500+350+300+250)/4 = 350
Average of 4 lightest boxes = (350+300+250+200)/4 = 275 Difference = (350-275) = 75