Hello Aspirants. Welcome to Online Quantitative Aptitude section in AffairsCloud.com. Here we are creating question sample From all topics , which are Important for upcoming IBPS and RRB exams. We have included Some questions that are repeatedly asked in exams. Do see the solutions, you might get any shortcut.

**What is the probability that when 3 cards are pulled from a pack of cards without replacement that we get 1 king, 1 queen and 1 jack?**

A. 16/35139

B. 1/2179

C. 16/5525

D. 16/2179

C. 16/5525

Explanation:

Case 1: first chosen is king, second is queen and third jack:

Prob = 4/52 * 4/51 * 4/50

There will be 6 cases like this, so total prob = (4/52 * 4/51 * 4/50) * 6

**In an examination consisting of 4 subjects, the marks obtained by Ram in 3 of them are 90%, 95% and 95% resp. Each subject is of equal marks. Under the given circumstances his average percentage marks for the examination cannot be**

A. 94%

B. 90%

C. 93%

D. 96%

D. 96%

Explanation:

Let 100 be max marks of each subject. Check each option now.

From option D, (90+95+95+x)/4 = 96, it gives x = 104 which is not possible because max marks is 100.

**The radius of a sphere is 14 cm. The cost of painting the surface of sphere is Rs 25 per square cm. If the radius of sphere is increased by 10%, then the cost of painting is increased by 20%. What is the percentage increase in the total cost of painting per square cm?**

A. 45.2%

B. 54.27%

C. 20.3%

D. 18.2%

A. 45.2%

Explanation:

Radius increases by 10%, so surface area changes by 10+10+((10*10)/100) = 21%

Total cost of painting = Rate * Surface area of sphere

So change in cost of painting = 21+20+((21*20)/100) = 45.2%

**In an election there were only two candidates A and B, B got 50% of the votes that A got. Had A got 200 votes less, there would have been a tie. How many people casted their votes in all?**

A. 1000

B. 1500

C. 1200

D. 1800

C. 1200

Explanation:

Let total votes casted = x

then 50/100 * A + A = x

when A got 200 votes less, means these 200 votes goes to B, there is tie, so

A – 200 = 50/100 * A + 200

A = 800

x = 1200**A 3 : 2 milk and water solution is mixed with another 4 : 1 milk and water solution. If the volumes are 400 ml and 1,000 ml resp., then what is the ratio of milk to water in the resultant solution?**

A. 9 : 5

B. 8 : 21

C. 5 : 26

D. 26 : 9

D. 26 : 9

Explanation:

In 400 lit, milk = 3/8 * 400 = 240 lit, water = 160 lit

In 1000 lit, milk = 4/5 * 400 = 800 lit, water = 200 lit

New ratio = (240+800)/(160+200)

**In 40 litres mixture of milk and water, the ratio of milk to water is 7 : 1. In order to make the ratio of milk and water 3 : 1, the quantity of water should be added to the mixture will be**

A. 6 3/4 litres

B. 6 2/3 litres

C. 6 litres

D. 6 1/3 litres

B. 6 2/3 litres

Explanation:

In 40 lit, milk = 7/8 * 40 = 35 lit, water = 5 lit

Let x lit of water to be added, so

35/(5+x) = 3/1

**A man swims downstream 30 km and upstream 18 km, taking 3 hrs each time. What is the speed of current?**

A. 6 km/hr

B. 4 km/hr

C. 2 km/hr

D. 10 km/hr

C. 2 km/hr

Explanation:

Downstream speed = 30/3 = 10, Upstream speed = 18/3 = 3

Speed of stream = (10 – 6)/2

**A man can row 7 km/hr in still water. In a stream which is flowing at 3 km/hr, it takes him 7 hrs to row to a place and come back. How far is the place?**

A. 25 km

B. 20 km

C. 10 hm

D. 15 km

B. 20 km

Explanation:

Distance = T (B^2 – R^2)/2*B

=7 (7^2 – 3^2)/2*7 = 20 km

**If a sum of money at a certain rate of interest doubles in 5 years and at a different rate of simple interest becomes three times in 12 years, then the better rate of interest is in**

A. case-1

B. case-2

C. equal in both cases

D. None of these

A. case-1

Explanation:

Case 1: SI = 2P – P = P, so P = P*r*5/100, so r = 20%

Case 1: SI = 3P – P = 2P, so 2P = P*r*12/100, so r = 16.66%

**The population of a town increases 10% half-yearly. What is the population after one and half years, if the initial population is 1,000?**

A. 1331

B. 1300

C. 1200

D. 1210

A. 1331

Explanation:

Solve it by the method of compounded semi-annually.

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