exam Maths Puzzle Numerical Ability

solve for x.

2 log2 x - log2 (x+4)= log2 2

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exam Other Question

log3(x-1)-log3(x+2)=2 1) When is the sum of any three consecutive numbers odd? when is it even?

2)I am a 2-digit prime number. the sum of my digits is 5, and the difference between them is 3. What number am I?

Please help me answer these questions