If x:y = 3:2 and y:z = 5:4, what is the value of x:z?
A15:8
B8:15
C5:3
D3:5
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Archives: MCQs
What is the greatest common divisor (GCD) of 105, 135, and 180?
A5
B15
C25
D35
A motorboat whose speed in still water is 15 km/h goes 30 km downstream and returns in a total time of 4.5 hours. What is the speed of the stream?
A3 km/h
B5 km/h
C6 km/h
D8 km/h
Find the area of a circle inscribed in a square of side 14 cm. (Use pi = 22/7)
A144 cm²
B154 cm²
C196 cm²
D616 cm²
Find the variance of the numbers: 2, 4, 6, 8, 10.
A4
B6
C8
D10
Two pipes can fill a tank in 12 minutes and 15 minutes respectively. A third pipe can empty it in 20 minutes. How long will it take to fill the tank if all three are open?
A8 minutes
B10 minutes
C12 minutes
D15 minutes
Evaluate: (27/64)^(-2/3).
A9/16
B16/9
C3/4
D4/3
If 2x + 3y = 12 and xy = 6, find the value of 4x^2 + 9y^2.
A72
B96
C108
D144
Find the length of the longest rod that can be placed in a room of dimensions 10 m x 10 m x 5 m.
A12 m
B15 m
C18 m
D20 m
If x – 1/x = 4, find the value of x^2 + 1/x^2.
A14
B16
C18
D20