book Maths Puzzle Numerical Ability

The area of a triangular plate is 16cm^2. If the base is 1cm longer than the height, what are the lengths of its base and height?
I am really unsure how to tackle this question.

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book Other Question
1.Prove that if *is an associative and commutative binary operation on a set S,then
(a*b)*(c*d)=[(d*c)*a]*b
for all a,b,c,d belong to S.
Assume the associat Solve 47,3/5+6n=83,3/4