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All i need is the answer there is no additional information

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^{x} / a^{y} = a^{x-y}

* W* = (20r

Since the area of a rectangle is related to it's length times width (A = L*W), then that formula can be rearranged to show that the width is the Area divided by the Length (W=A/L). So:

W = 20r5s7t4/4r2s5t2 (substitute the given expressions for A and L)

W = 20*5*7*4*r*s*t / 4*2*5*2*r*s*t (rearrange to make it easier to see that r, s, & t cancel)

W = 20*5*7*4 / 4*2*5*2 (rewrite after cancellation)

W = 35 (perform the division from above)

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