browny2213 browny2213

21-04-2014
Mathematics

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translate question into an equation, let x be unknown number 6.4 is 90% of what number?

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Dannymal Dannymal

21-04-2014

6.4 = 90% x X
X =?
Happy to Help!

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21-04-2014

\(1 \% = \frac{1}{100}\\ \\90 \% * x =6.4 \\ \\\frac{90}{100}x=6.4 \\ \\\frac{9 }{10 }x=6.4 \ \ *(\frac{10}{9})\\ \\x= 6.4 *\frac{10}{9}\\ \\x=\frac{64}{9}\\ \\x = 7\frac{1}{9}\)

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