book Maths Puzzle Numerical Ability

I am having problems extracting the roots from the problem 2x^2 /3 = 4
Two x squared over three = four

I know that eventually the four will root down to two

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book Other Question

Could you please help solve the following...

L+1
_____ = 4

8

Should I begin by making it L/8 + 1/8 = 4?
Each girl in the Lynberg family has the same number of brothers as she has sisters. Each boy in the family has twice as many sisters as he has brothers. How many girls & boys are t