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Simplify: (0.3 * 0.3 + 2 * 0.3 * 0.7 + 0.7 * 0.7).
A0.49
B0.81
C1.00
D1.21
A radius of a circle is increased by 20%. By what percentage does its area increase?
A40%
B42%
C44%
D48%
A box contains 4 red cards and 6 black cards. Two cards are drawn one after another without replacement. What is the probability that both are red?
A2/15
B4/25
C2/9
D3/10
Find the perimeter of a semi-circle with radius 14 cm. (Use pi = 22/7)
A44 cm
B58 cm
C72 cm
D88 cm
Two dice are thrown simultaneously. What is the probability of getting a sum of 8?
A5/36
B1/6
C7/36
D2/9
A boat can travel 15 km downstream in 30 minutes. If the speed of the stream is 5 km/h, find the speed of the boat in still water.
A20 km/h
B25 km/h
C30 km/h
D35 km/h
If 40% of a number is equal to two-thirds of another number, what is the ratio of the first number to the second number?
A2 : 5
B3 : 5
C5 : 3
D5 : 2