book Maths Puzzle Numerical Ability

What is the reclusive formula?

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book Other Question

(4/5)x + 18 = 12
(4/5)x = 12 + 18
(4/5)x = 30
x = 30(4/5)
just 2 questions that are linked

if log(base 2)5 = x find an expression for...
1. log (base 2)20 = ??
2. log (base 2)[(cube root 5)/2]=??

if u could answer these that would be a huge help thx