

Directions: Read the rules listed below.
A and B undertake a work of digging aditch ,alternately for a day each. If A can dig a ditch in “a” days and B can dig a ditch in “b” days ,will the work be completed faster if A begins?
Explanation: If N is a positive integer , it would not make the difference who would start the work Since the work would be completed in number of days which would be a multiple of 2.So it does not make the difference who starts the work. It would make the only if N is not an integer.
Directions: Read the rules listed below.
By how much percentage has the Total surface area has increased of a Cylinder?
Explanation: You will be able to determine the percentage change in the lateral surface area as well as in curved surface area . But not in the case of their addition .
Directions: Read the rules listed below.
What is the value of the four digit number abcd , where abcd * d =dcba and dcba is also a four digit number??
Explanation: The question can be answered with the help of option (a) only. 1089* 9= 9801.
Directions: Read the rules listed below.
X = p^4 + p^2 , Where p is a natural number. What will occur at the unit’s place of the number X?
Explanation: X can end with 0,2 or 6 only. So ,if it is written that X have composite last digit , only option left is 6.
Directions: Read the rules listed below.
A and B together can do apiece of work in “p” days , B and C together in “q” days, C and A together in “r” days. Working alone , who among A,B and C can complete the work fastest?
Explanation: q > p means that A will take more time than C to complete the same work. r > q means that A will take more time than B. So if we take both the options together than we can’t about the gastest one.