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A box contains 3 red, 4 white, and 5 blue balls. If one ball is drawn at random, what is the probability that it is NOT red?
A1/4
B1/2
C3/4
D5/6
In how many ways can 6 people be seated around a circular table?
A120
B240
C360
D720
Present ages of father and son are in ratio 7:2. After 10 years, ratio will be 9:4. What is the father’s present age?
A35 years
B42 years
C49 years
D56 years
A boat travels 24 km downstream in 2 hours and 16 km upstream in 4 hours. Find the speed of the stream.
A2 km/h
B3 km/h
C4 km/h
D5 km/h
Find the mean deviation about mean for numbers: 3, 6, 9, 12, 15.
A2.4
B3.0
C3.6
D4.2
If 12 men or 15 women can finish a task in 20 days, how long will 4 men and 5 women take?
A20 days
B24 days
C30 days
D36 days
If the price of petrol increases by 25%, by what percentage must a motorist reduce consumption so that expenditure remains unchanged?
A15%
B20%
C22.5%
D25%