Quantitative Aptitude Practice Question and Answer
8Q: A room contains 3 brown, 5 black and 4 white chairs. Two chairs are picked and are put in the lawn. What is the probability that none of the chairs picked is white ? 2016 05b5cc6c5e4d2b4197774ddbe
5b5cc6c5e4d2b4197774ddbe- 114/33true
- 214/55false
- 312/55false
- 413/33false
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Answer : 1. "14/33"
Explanation :
Answer: A) 14/33 Explanation: Total number of chairs = (3 + 5 + 4) = 12. Let S be the sample space. Then, n(s)= Number of ways of picking 2 chairs out of 12 = 12×11/2×1 = 66 Let n(E) = number of events of selecting 2 chairs for selecting no white chairs. => 8C2 = 8×7/2×1 = 28 Therefore required probability = 28/66 = 14/33.
Q: A Bus travels first half distance between two places with a speed of 40 kmph and the rest half distance with a speed of 60 kmph. The average speed of the Bus is ? 2013 05b5cc764e4d2b4197774fda3
5b5cc764e4d2b4197774fda3- 148 kmphtrue
- 250 kmphfalse
- 346 kmphfalse
- 442 kmphfalse
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Answer : 1. "48 kmph"
Explanation :
Answer: A) 48 kmph Explanation: we know that speed = distance traveled/time takenlet the total distance traveled by the car is 2x km.then time taken by it to cover first half is x/60 hour.and for second half is x/40 hour.Then average speed= total distance travelled / total time taken. i.e. 2xx60+x40 => 2x5x120 = 48 kmph.
Q: Prashanth sold a album for $ 735 and made a profit of 22.5% . The cost price of the album went up by $120 and so Prashanth increased the selling price by $120. What is his profit % now ? 2013 05b5cc715e4d2b4197774f431
5b5cc715e4d2b4197774f431- 119.32 %false
- 218.75 %true
- 321.41 %false
- 422 %false
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Answer : 2. "18.75 %"
Explanation :
Answer: B) 18.75 % Explanation: Prashanth sold a album for $ 735 and made a profit of 22.5% .CP = 735 x 100/122.5 = Rs. 600New CP = 600 + 120 = Rs. 720New SP = 735 + 120 = Rs. 855. Profit = Rs. 135. profit % = 100 x 135/720 = 18.75%.
Q: Find the next number in the given number series? 2, 19, 0, 21, –2, ? 2012 05b5cc69de4d2b4197774c8f5
5b5cc69de4d2b4197774c8f5- 123true
- 225false
- 327false
- 429false
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Answer : 1. "23"
Explanation :
Answer: A) 23 Explanation: The given number series 2, 19, 0, 21, –2, ? follows a pattern, 2 2 + 17 = 19 19 - 19 = 0 0 + 21 = 21 21 - 23 = -2 -2 + 25 = 23 Hence, the next number in the series is 23.
Q: In a 100 litre of mixture the ratio of milk and water is 6:4. How much milk must be added to the mixture in order to make the ratio 3 : 1? 2012 05b5cc6b4e4d2b4197774d4e3
5b5cc6b4e4d2b4197774d4e3- 185false
- 260true
- 355false
- 445false
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Answer : 2. "60"
Explanation :
Answer: B) 60 Explanation: Let M litres milk be added => 60 + M40 = 31 => 60 + M = 120 => M = 60 lit.
Q: What is 15 of 80 with simple method and examples? 2010 05b5cc6b3e4d2b4197774d46d
5b5cc6b3e4d2b4197774d46d- 112.5%false
- 218.75%true
- 316.55%false
- 417.80%false
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Answer : 2. "18.75%"
Explanation :
Answer: B) 18.75% Explanation: Given that to find 15 of 80 => What % of 80 is 15 Let it be 'p' => p% of 80 = 15 => p x 80100 = 15⇒p = 15 x 10080⇒p = 150080 = 18.75 Therefore, 15 is 18.75% of 80 => 18.75% of 80 = 15 Example:: Now, in the similar way we can find 15% of 80 =? => 15x80/100 = p => p = 4 x 3 = 12 Therefore, 15% of 80 = 12
Q: A trader marked the price of the T.V. 30% above the cost price of the T.V. and gave the purchaser 10% discount on the marked price, thereby gaining Rs.340. Find the cost price of the T.V ? 2009 05b5cc6e0e4d2b4197774eb9d
5b5cc6e0e4d2b4197774eb9d- 1Rs. 2000true
- 2Rs. 1600false
- 3Rs. 2200false
- 4Rs. 2100false
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Answer : 1. "Rs. 2000"
Explanation :
Answer: A) Rs. 2000 Explanation: Let 'x' be the cost price.Now Marked price = x + 30x/100 = 13x/1010% discount = 10/100 x 13x/10 = 13x/100 Selling price = 13x/10 - 13x/100 = 117x/100Given gain = 340Here gain = 117x/100 - x = 17x/100 = 340 => x = Rs. 2000.
Q: The sum of the digits of a two-digit number is 12. The difference of the digits is 6. Find the number ? 2007 05b5cc6d8e4d2b4197774e7af
5b5cc6d8e4d2b4197774e7af- 157false
- 275false
- 348false
- 439true
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Answer : 4. "39"
Explanation :
Answer: D) 39 Explanation: Let the two-digit number be 10a + ba + b = 12 --- (1)If a>b, a - b = 6If b>a, b - a = 6If a - b = 6, adding it to equation (1), we get2a = 18 => a =9so b = 12 - a = 3Number would be 93.if b - a = 6, adding it to the equation (1), we get2b = 18 => b = 9a = 12 - b = 3.Number would be 39.There fore, Number would be 39 or 93.