What is the square of 49 divided by 162? I haven't learned yet, It's a weight formula. The number of kilos of weight divided by the square of the height of the body

What is the square of 49 divided by 162? I haven't learned yet, It's a weight formula. The number of kilos of weight divided by the square of the height of the body

49÷162²
=49÷162×162
=49÷26244
=49 / 26244
(if you don't write the fraction, it means that you can't divide the decimal infinitely)
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How much is 45 * 24?

1080

What is (x-45) / (x-24) = 62.5%?

（x-45)/(x-24)=62.5%
x-45=0.625(x-24)
x-45=0.625x-15
x-0.625x=-15+45
0.375x=30
x=80