exam Maths Puzzle Numerical Ability

Hi, Can I have some help finding f of g of h?

f(x)=sqrt(x), g(x)=x/x-1, h(x)=3sqrt(x)

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solve for V2
P1V1/T1=P2V2//T2
The sales representative here tells you they also have two floor plans available, but they only have 38 homes available. Write an equation that illustrates the situation. Use x and