If log_2(x) = 5, what is the value of x?
A10
B25
C32
D64
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Archives: MCQs
The mean of 5 observations is 12. If one observation 20 is deleted, what is the new mean?
A10
B11
C12
D13
If a:b = 2:3 and b:c = 4:5, what is a:c?
A8:15
B2:5
C6:15
D8:12
Find the perimeter of a square whose area is 144 cm².
A36 cm
B48 cm
C52 cm
D64 cm
A train 150 m long passes a telegraph post in 9 seconds. What is the speed of the train in km/h?
A50 km/h
B60 km/h
C72 km/h
D80 km/h
What is the third proportional to 4 and 12?
A24
B36
C48
D72
What is the discount percentage if a book marked at Rs. 250 is sold for Rs. 200?
A15%
B20%
C25%
D30%
The present ages of father and son are in the ratio 7:2. If the father is 30 years older than the son, what is the son’s age?
A10 years
B12 years
C14 years
D16 years
If 3^(x-1) = 27, what is the value of x?
A3
B4
C5
D6
The product of two numbers is 120 and their HCF is 6. What is their LCM?
A12
B20
C24
D30