exam Maths Puzzle Numerical Ability

If 20 percent of x equals 80 percent of y, which of the following expresses y in terms of x?

(A) y=16% of x
(B) y=25% of x
(C) y=60% of x
(D) y=100% of x
(E) y=400% of x

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exam Other Question

Geometry. Find the perimeter of the triangle shown in the figure.

Side: 4 Side: {{{sqrt(5)+sqrt(3)}}} bottom: {{{sqrt(5)-sqrt(3)}}}

I need some help with this problem. Thank
If f(x) = 4x - 3, find the following:

f(-1)

Can you show me how to figure this, I do not understand.

Thank you.