exam Maths Puzzle Numerical Ability

how to calculate the percentage of $1722.50 that is equal $277.27?

please teach how to write this equation

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exam Other Question

I need help on these problems.

A=1/2bh for h

I=prt for p

ax+by=c fro y

P=2(l=w) for l

y=mx+b for x

ax+by=c for y

P=2(l+w) for l Solve each of the equations for x.
2(x - 5)^2 = 3