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A boat travels 24 km upstream in 4 hours and 36 km downstream in 3 hours. What is the speed of the current?

A2 km/h

B3 km/h

C4 km/h

D5 km/h

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If the area of a circle is 154 cm², find its circumference. (Use pi = 22/7)

A22 cm

B33 cm

C44 cm

D66 cm

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Find the standard deviation of the numbers: 3, 5, 7, 9, 11.

A2.0

B2.83

C4.0

D8.0

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A tank can be filled by Pipe A in 5 hours and Pipe B in 10 hours, while Pipe C empties it in 20 hours. If all three are opened together, how long to fill the tank?

A4 hours

B4.4 hours

C5 hours

D5.5 hours

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Evaluate: 16^(3/4).

A4

B6

C8

D12

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If x + y = 12 and xy = 35, find the value of x^3 + y^3.

A468

B472

C480

D504

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What is the area of a right-angled isosceles triangle with hypotenuse 10 cm?

A25 cm²

B50 cm²

C75 cm²

D100 cm²

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Solve for x: (2x + 5) / 3 = (x + 7) / 2.

A9

B11

C13

D15

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If 35% of a number is 105, what is 80% of that number?

A210

B240

C280

D320

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A card is drawn at random from a standard deck of 52 cards. What is the probability of drawing a Spade or an Ace?

A4/13

B16/52

C17/52

D9/26

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