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# Placement Questions & Answers :: TCS

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Not Attempted

361. How many liters of a 90% of concentrated acid needs to be mixed with a 75% solution of concentrated acid to get a 30 liter solution of 78% concentrated acid?

Explanation:

concentration is given which is wrt 100, hence we can take x lt of 90% and (30-x)of 75%
x*90 + (30-x)*75 = 30*78 hence the ans is 6 ltr.

Tags: TCS

Not Attempted

362. In this question A^B means A raised to the power B. If f(x) = ax^4 - bx^2 + x + 5 and f(-3) = 2, then f(3) =

Explanation:

Here is no explanation for this answer

Tags: TCS

Not Attempted

363. A card from a pack of 52 cards is lost. From the remaining cards of the pack, two cards are drawn and are found to be both spade. Find the probability of the lost card being a spade.

Explanation:

Here is no explanation for this answer

Tags: TCS

Not Attempted

364. A alone can do 1/4th of the work in 2 days. B alone can do 2/3th of the work in 4 days. If all the three work together, they can complete it in 3 days so what part of the work will be completed by C in 2 days?

Explanation:

A can do the total work in 8 days, and B can do it in 6 days.
Let the total work be 24 units. Now capacities are
A = 24/8 = 3,
B = 24/6 = 4,
A + B + C = 24/3 = 8
So Capacity of C = 1 unit.
In two days C will do 2 units which is 2/24th part of the total work. So 1/12th part.

Tags: TCS

Not Attempted

365. Eesha bought two varities of rice costing Rs. 50 per kg and Rs. 60 per kg and mixed them in some ratio. Eesha sold that mixture at Rs. 70 per kg making a profit of 20 %. What was the ratio of the micxture?

Explanation:

let x be the price of the rice after mixing
So, 120*x/100=70
x=175/3

By eligation method
the required ratio = (60-175/3) : (175/3-50) = 1:5

Tags: TCS

Not Attempted

366. A circular swimming pool is surrounded by a concrete wall 4ft wide. If the area of the wall is 11/25 of the area of the pool then radius of the pool in feet is

Explanation:

Here is no explanation for this answer

Tags: TCS

Not Attempted

367. The number of times a bucket of capacity 4 litres to be used to fill up a tank is less than the number of times another bucket of capacity 3 litres used for the same purpose by 4. What is the capacity of the tank?

Explanation:

Let the capacity of the tank be x
no.of times a bucket of capacity 4 liters :x/4
for 3 liters: x/3
x/3-x/4=4
x=48

Tags: TCS

Not Attempted

368. A series of books were published at seven years intervals when the seventh book was issued the sum of the publications years was 13524, when the first book was published?

Explanation:

x+x+7+x+14+x+21+x+28+x+35+x+42=13524
7x+147=13524 then x=1911

Tags: TCS

Not Attempted

369. A horse starts to chase a dog that has left the stable two hours earlier. The horse runs at an average speed of 22km/hr. It crosses a 10 metre road, two small ponds 3 metres deep, and finally runs along two small streets of 200 metres long. After traveling 6 hrs, 2 hrs after sunset, it catches the dog. Compute the speed of the dog in Km/hr?

Explanation:

Here is no explanation for this answer

Tags: TCS

Not Attempted

370. The least number that must be subtracted from 63520
to make the result a perfect square, is:
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