MBA Exam Numerical Ability Time and Work

raju can do a piece of work in 10 days, vicky in 12 days,tinku in 15 days. they all start work togather but raju leaves after 2 days, vicky leaves 3 days before the work is completed , in how many days work is completed?

1) 7
2) 5
3) 9
4) 6

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MBA Other Question

If O is any point on the circumference of the circle I and circle II is drawn taking O as its center such that its circumference bisects the circumference of I.If the area of the circle I is (4* pie) cm^2, what is the area of circle I not common to circle II..(options in cm^2)

1) 2.5 pie
2) 4
3) 2
4) 5 *pie / 3
In a list of 7 integers, one integer, as x is unknown.The other six integers are 20, 4, 10, 4, 8 and 4. Ifthe mean, median, and mode of these sevenintegers are arranged in increasing order, theyform an arithmetic progression. The sum of allpossible values of x is ?

1) 26
2) 32
3) 34
4) 38
5) 40