exam Maths Puzzle Numerical Ability

I need help simplifying and solving the following equation for H:

A= 1/2h(a+b).

I got to 2A=ha + hb. Is this right? How do I solve for H from here?

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exam Other Question

Construct a Venn Diagram and use it to answer the following questions:
(a) How many of the resorts provided only refrigerators in the guest rooms?
(b) How many of the resorts p express as a binomial: 5(x+2)+2(1-6x)