26th feburary GRE Quants Question

1. Form a given set of numbers 2, 3, 4, 5, 6, 7, 8 & 9, find the number of ways of forming a four-digited number(without repetition)?
Ans: 840


2. If x>y, then
Col A: |x+y|
Col B: |x-y|
Ans: D


3. If (x-2)^(x-4) = 1, then
Col A: x
Col B: 4
Ans: C


4. The value of 5000+sqrt(6.9 * 7002.1) is ......
Ans: Around 5220


5. Given two groups G and M, G Group has 25000 people and M group has 30000 people. A total of 50000 people group is formed by using these two groups. If one person is selected from G group then what is the probability that he is also from M group?
Ans: 0(if they are disjoint groups)
Else it is 1/5


6. A person 'B' types 2 papers in 3 seconds and a person 'C' types 1 paper in 1/2 sec. If they start working independently at same time. How many minutes will they take to type 8000 papers?
Ans: 50min (or) 3000secs


7. Given two points of a line as (3, k) & (5, m). If the slope of the line is 4, then what is the relation between k & m?
(Similar to this)
Ans: m = 8 + k


8. If the mean of 30 numbers is 1.68 and the mean of first 20 numbers is xx(some value), then what is the mean of rest 10 numbers?
(something like this)


9. Given lateral surface area of a cuboid and asked to find the volume of it?