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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
Find the value of (x^(a-b))^(a+b) * (x^(b-c))^(b+c) * (x^(c-a))^(c+a).
A0
B1
Cx
Dx^(a+b+c)
The sides of a triangle are in the ratio 3 : 4 : 5 and its perimeter is 144 cm. What is the area of the triangle?
A432 cm²
B864 cm²
C1080 cm²
D1152 cm²
The ratio of present ages of A and B is 4:5. After 5 years, the ratio becomes 5:6. What is A’s present age?
A15 years
B20 years
C25 years
D30 years
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
Find the population standard deviation of the numbers: 2, 4, 6, 8, 10.
A2.83
B3.16
C4.00
D8.00
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
If 8 men can build a wall in 12 days, how many men are required to build the same wall in 6 days?
A12
B14
C16
D18
A man rows downstream at 18 km/h and upstream at 12 km/h. Find the speed of the man in still water.
A14 km/h
B15 km/h
C16 km/h
D17 km/h