book Maths Puzzle Numerical Ability

what is the difference between discrete and continuos data?

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book Other Question

Could you please help me solve the following Question:
{{{log(2,x)+log(3,(x+1))=4}}}
I have tried many ways of solving this including changing bases, but they always seem to end
1. x+x-4+x-7=19

2. 3x+x-6=54

3. 40=2 (3x+4+x)

HELP