exam Maths Puzzle Numerical Ability

square root of p + square root of p+3=3

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exam Other Question

Please help me to solve these questions:
1. given f(x) =.5x(half x)and g(x)=x-2, calculate
(a)g(-2)
(b)fg(4)
(c)f-1(4) a recipe requires 3 cups of flour to make 27 dinner rolls. how muck flour is needed to make 9 rolls