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If the radius of a sphere is reduced by 50%, by what percentage does its surface area decrease?
A50%
B60%
C75%
D80%
A bag contains 5 red, 3 blue, and 2 yellow balls. Two balls are drawn one after another without replacement. What is the probability that both are red?
A1/9
B2/9
C4/9
D5/9
The HCF and LCM of two numbers are 8 and 48 respectively. If one number is 24, find the other number.
A12
B16
C20
D32
A vertical pole 12 m long casts a shadow 8 m long on the ground. At the same time, a tower casts a shadow 40 m long. Find the height of the tower.
A45 m
B50 m
C60 m
D75 m
If 30% of (A + B) = 50% of (A – B), find the ratio A:B.
A2:1
B3:1
C4:1
D5:1
Find the length of the altitude of an equilateral triangle with side length 12 cm.
A4*sqrt(3) cm
B6*sqrt(3) cm
C8*sqrt(3) cm
D9 cm