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A bag contains 4 red, 5 green, and 6 yellow balls. A ball is drawn at random. What is the probability that it is green or yellow?
A1/3
B2/3
C11/15
D4/15
A box contains 6 red, 4 white, and 8 blue balls. If one ball is drawn at random, what is the probability that it is NOT white?
A2/9
B4/9
C5/9
D7/9
Two pipes A and B can fill a cistern in 15 hours and 20 hours respectively. A third pipe C can empty it in 30 hours. If all three work together, how long to fill the cistern?
A10 hours
B12 hours
C15 hours
D18 hours
The parallel sides of a trapezium are 12 cm and 18 cm, and its area is 150 cm². Find the height of the trapezium.
A8 cm
B10 cm
C12 cm
D15 cm
At what angle are the hands of a clock inclined at 8:20?
A120°
B130°
C140°
D150°
A sum of money quadruples (becomes 4 times) in 12 years at simple interest. Find the rate of interest per annum.
A20%
B22.5%
C25%
D30%
If 10th March 2003 was Monday, what day of the week was 10th March 2004?
ATuesday
BWednesday
CThursday
DFriday
If the radius of a sphere is doubled, by what factor does its volume increase?
A2 times
B4 times
C6 times
D8 times