exam Maths Puzzle Numerical Ability

Points A,B,C,and D are placed in that order on a line so that AB = 2BC = CD. Then,
BD as a fraction of AD is

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exam Other Question
m^3-MN^2/MN^2+M^N-2M^3 Find the perimeter and area of a triangle measuring 5x3x4

I think the perimeter = 5x3x4=60
I think the area= 5+3+4=12