**The average age of a man and his son is 28 years. The ratio of their ages is 3 :1 respectively. What is the man's age?**- 30 years
- 38 years
- 40 years
- 42 years
- None of these

Answer : Option D.

Total sum of man's age & his son's age =28 Ã— 2 = 56 Now, the Ratio of their ages is 3 : 1.Therefore, Man's age = (3/4) Ã— 56 = 42 So, the correct answer is option D.

So, the correct answer is option D.**A basket contains 3 blue, 5 black and 3 red balls. If 3 balls are drawn at random what is the probability that all are black?**- 2/11
- 1/11
- 3/11
- 8/33
- None of these

Answer : Option E.

Ways of selecting 3 black balls out of 5 -^{5}C_{3}Total ways of selecting 3 balls -^{11}C_{3}The required probability = (^{5}C_{3}/^{11}C_{3}) = (10/165) = (2/33)

**The ratio of the capacity to do work of A and B is 3 : 2. If they together can complete a work in 18 days, then how long does A take to complete the work alone?**- 45
- 30
- 24
- 40
- None of these

Answer : Option A.

Let A and B take 3x and 2x days to complete the work

1/3x+1/2x=1/18 ;x=15

So A will take 45 days.**How many integers are there between 300 and 600 that are divisible by 9?**- 33
- 31
- 28
- 25
- None of these

Answer : Option A.

The sequence is 306,â€¦ 594 594=306+(n-1)9â‡’288=(n-1)9â‡’n=33**The sum of two numbers is 14. If the sum of their reciprocals is 7/24, find the numbers:**- 4,8
- 8,12
- 4,10
- 6,8
- None of these

Answer : Option C.

Going by option , option number 3 and 4 will give sum = 14 but 4th option will give l.c.m 24 and third option gives LCM as 20. It has to be the fourth option.Mu Sigma Preparation Links- Sample Aptitude Questions of Mu Sigma
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**A, B, C and D are four consecutive odd numbers and their average is 42. What is the product of B and D?**- 1860
- 1890
- 1845
- 1677
- None of these

Answer : Option C.

As there are As diff. Is same so average should lie between B and C so B is 41 & C is 43 so D must be 45 as we have to find the product of B and D so it would be 1845.**The product of two alternative multiples of 4 is eight more than five times their sum. What are the two numbers?**- 16,32
- 12,20
- 8,16
- 16,24
- None of these

Answer : Option C.

Though options, 3rd option satisfies all the conditions.**Find the three terms in arithmetic series such that their sum is 30 and product is 910**- 8,10,12
- 7,10,13
- 6,10,14
- 5,13,14
- None of these

Answer : Option B.

Option 2nd gives product 910.**A car covers the first 30 km of its journey in 45 minutes and the remaining 25 km in 30 minutes. What is the average speed of the car?**- 40km/hr
- 64km/hr
- 49km/hr
- 48km/hr
- None of these

Answer : Option E.

Average speed = = 44 km/hr So option E is the answer.**What is 25% of 30% of 2/5 of 2000 ?:**- 36
- 40
- 56
- 60
- none of these

Answer : Option D.

25% of 30% of 2/5 of 2000 1/4 A— 3/10 A— 2/5 A— 2000 =60