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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
[tex] \frac{n}{100} [/tex] × 90 = 50
[tex] \frac{n}{100} [/tex] ×[tex] \frac{90}{90} [/tex] = [tex] \frac{50}{90} [/tex]
90 and 90 cancels out
[tex] \frac{n}{100} [/tex] = [tex] \frac{5}{9} [/tex]
[tex] \frac{n}{100} [/tex] × 100 = [tex] \frac{5}{9} [/tex] × 100
100 and 100 cancels out   
n = 55.55..%  ≈  55.6%
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