Find the wrong number in the series:

7, 28, 63, 124, 215, 342, 511

7, 28, 63, 124, 215, 342, 511

Clearly, the correct sequence is

(23 - 1), (33 - 1), (43 - 1), (53 - 1), (63 - 1), (73 - 1), (83 - 1).

So 28 is wrong and should be replaced by (33 - 1) i.e. 26.

Hence, the answer is (B)..

A car travels first half distance between two places with a speed of 40 kilometre per hour and rest of half distance with a speed of 60 km per hour. The average speed of car is:

Let the total distance covered be"s" km.

Total time taken,

=(s/2)/30+(s/2)/60

=3s/120

Average speed,

=s/(3s/120)

=s(120/3s)

=40 km/hr

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If A+ B means A is the mother of B.

A/B means A is the brother of B.

AÃƒâ€”B means A is the son of B and

A-B means A is the daughter of B,

which of the following means C is the niece of D?

C is the niece of D means C is the daughter of the brother ( say P ) of D i.e. C-P/D.

The first two terms of a sequence are 1 and 2. Each of the following terms in the sequence is the sum of all the terms which come before it in the sequence. Which of these is not a term in the sequence?

The third term of the sequence is 1 + 2 = 3, the fourth term is 1 + 2 + 3 = 6, the fifth term is 1 + 2 + 3 + 6 = 12, and so on. So the sequence begins 1, 2, 3, 6, 12, 24, 48, 96 The trick is spotting that from the 4th term onwards each term is just double the previous term. Therefore 72 does not appear.

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Salesman, engineer and accountant . There are two married couple,s in the family . De, the salesman is married to the lady teacher. The doctor is married to the lawyer. F ,the accontent is the son of B and brother of E. C, the lawyer is the daughter in law of A. E is the unmarried engineer. A is the grandmother of F.

What is the profession of B.

C is the daughter in law of A Who is the grandmother of means C is the mother of F. But F is the son of B. So, B is C's husband. But C, the lawyer,is married to the doctor.So,B is the docter.F, the Accountant, will be the son of B and C.E is the unmarried engineer. So, the other married couple can be that of grandmother of F i.e. A, and D.But D, the sale man, is married to the lady teacher. So, D the salesman is the grandfather of F father of B and the husband of A , the lady teacher. Clearly, B is the doctor..

A group of workers can do a piece of work in 24 days however as 6 of them were absent it took 30 days to complete the work how many people actually worked on the job to complete it?

Let X workers are required to complete the job.

As workers and days are inversely proportional to each other so

(X-6)/x=24/30

30x-180=24x

6x=180

X=30