exam Maths Puzzle Numerical Ability

find the area of an equilateral triangle with one side measuring 20cm

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exam Other Question

Hi, I tried to solve for 5x^2=3x+2 and thought the answer is x=2/5 and x=-2.
Also, I tried to solve 3x^3 +2x^2=x and came up with x=0, 1/3, -1. I am not
sure of these answers. Can you please help me? Thank you! Jo read 50 pages of a novel in 4 hours.
At the same rate, how long would it take Jo to read 400 pages?