exam Maths Puzzle Numerical Ability

solve.
{5x+ 2y=28 and 3x-4y=48

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exam Other Question

Approximately, what is the area of a circular swimming pool that has a 36 foot diameter? please solve the problem for me.
nC0.nCn + nC1.nCn-1 + nC2.nCn-2 + ...........+nCn.nC0=(2n!)/(n!)^2