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The circumference of a circle exceeds its diameter by 30 cm. Find the radius of the circle. (Use pi = 22/7)
A7 cm
B10.5 cm
C14 cm
D21 cm
A fair die is thrown once. What is the probability of getting a prime number?
A1/6
B1/3
C1/2
D2/3
Simplify: (0.75 * 0.75 * 0.75 – 0.25 * 0.25 * 0.25) / (0.75 * 0.75 + 0.75 * 0.25 + 0.25 * 0.25).
A0.25
B0.50
C0.75
D1.00
If 20% of a number is added to 80, the result is the number itself. What is the number?
A90
B100
C110
D120
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
Find the sum of all two-digit numbers divisible by 5.
A945
B950
C955
D960
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