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A box contains 5 red and 5 blue balls. Two balls are drawn one by one WITH replacement. What is the probability that both are red?
A1/4
B1/2
C3/4
D1/5
What is the height of an equilateral triangle with side length 10 cm?
A5 cm
B5*sqrt(3) cm
C10*sqrt(3) cm
D15 cm
A sum of money quadruples (becomes 4 times) in 15 years at simple interest. What is the rate of interest per annum?
A15%
B20%
C25%
D30%
If the ratio of radii of two cylinders is 2:3 and their heights are in the ratio 5:3, find the ratio of their volumes.
A10 : 9
B20 : 27
C8 : 27
D15 : 16
Two numbers are 20% and 50% more than a third number respectively. What is the ratio of the two numbers?
A2 : 5
B3 : 5
C4 : 5
D5 : 6
A bag contains 3 red, 5 green, and 4 blue balls. If two balls are drawn at random together, what is the probability that both are green?
A5/33
B2/11
C5/22
D1/6
A rectangular plot 100 m long and 80 m wide has a path 5 m wide all around inside it. Find the area of the path.
A1700 m²
B1800 m²
C1900 m²
D2000 m²
In how many ways can 5 boys and 3 girls be seated in a row such that all 3 girls are always together?
A720
B1440
C2880
D4320