book Maths Puzzle Numerical Ability

Could you please help solve the following...

L+1
_____ = 4

8

Should I begin by making it L/8 + 1/8 = 4?

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book Other Question

a single die is rolled twice. what is the probablity of getting a 3 on the first roll and a number greater than 4 on the second roll? 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