Periyar University 2008 B.E Electronics

Ans: 16





22) If 20 men take 15 days to complete a job, in how many days can 25 men finish that work?

Ans. 12 days




23) 1 fast typist kind a few matter in 2hr and a different slow typist kind the identical matter in 3hr. if both do combine in how much time they will finish.


Ans: 1hr 12min




24) A man shapes three cardboards in 50 minutes, how many kinds of cardboard does he shape in five hours?

Ans: 18cardboards





25) A work is done by 2 people in 24 min. 1 of them can do this work a lonely in 40 min. how much time needed to do the identical work for the 2nd person.
Sol: (A+B) can do the work in = 1/24 min.
A alone can do the identical work in = 1/40 min.
B alone can do the identical work in = (A+B)’s – A’s = 1/24 – 1/40 = 1/60
=> B can do the identical work in = 60 min
Ans: 60 min





26) A can do a piece of work in 20 days, which B can do in 12 days. In nine days B does ¾ of the work. How many days will A take to finish the remaining work?




27) Anand finishes a work in seven days; Bittu finishes the identical job in eight days and Chandu in six days. They take turns to finish the work. Anand on the 1st day, Bittu on the 2nd and Chandu on the 3rd day and then Anand again and so on. On which day will the work get over?

A) third b) sixth c) ninth d) 7th




28) three men finish painting a wall in eight days. 4 boys do the identical job in seven days. In how many days will two men and two boys working together paint 2 such walls of the identical size?



A) six 6/13 days

B) three 3/13 days

C) nine 2/5 days

D) 12 12/13 days




29) what's the ans for that?

A, B and C are eight bit no's. They are as follows:

A -> one 1 0 0 0 one 0 1

B -> 0 0 one 1 0 0 one 1

C -> 0 0 one 1 one 0 one 0 (- =minus, u=union)

obtain ((A - C) u B) =?

Sol: We have to obtain (A-C) U B

Earning:   Approval pending.