Hey can you state what's wrong in the given solution. =》

we know, zero is always equal to zero

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because, 16 - 16 = 0
and 20 - 20 = 0

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taking 4 as common from 16 - 16 and 5 as common from 20 - 20
now dividing both sides by
(4 - 4)

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=》
because, (4 - 4) in denominators of both sides cancels out (4 - 4) in numerator of both sides.

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we know, 4 = 2 + 2 , so plugging (2 + 2) in place of 4

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As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.