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SmarticalParticals

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x% of 90 is 50

In math

"of" means multiply
"is" means equals

x% of 90 is 50 means

x% x 90 = 50
90x = 50
x = 50/90
x = .5555

Multiply by 100 to convert to percent (move decimal 2 places to the right)

.5555 = 55.55% = 55.6% rounded to the nearest tenth

penfila11Pen

% of 90 = 50
Lets keep n as the percentage
\(\frac{n}{100}\) × 90 = 50
\(\frac{n}{100}\) ×\(\frac{90}{90}\) = \(\frac{50}{90}\)
90 and 90 cancels out
\(\frac{n}{100}\) = \(\frac{5}{9}\)
\(\frac{n}{100}\) × 100 = \(\frac{5}{9}\) × 100
100 and 100 cancels out   
n = 55.55..%  ≈  55.6%

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