exam Maths Puzzle Numerical Ability

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g(h(15))

if
g(x)=70
h(x)= -x^2 + 6x

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exam Other Question

Can someone please help me solve this problem:

For what value of k is f(g(x)) = g(f(x))?

f(x)=3x+k and g(x)=x-4/3

I think when k is found we inverse it but I am drawing a blank - please help The reciprocal of a number plus the reciprocal of twice the number equals 3/10. Find the number.