40 is what percent of 50?

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Answer 1 · 2016-06-24T02:34:17

$\frac{40}{50} \times 100 = 80 %$ $40/50xx100=80%$

$x$ $x$ is the numerator = 40

$y$ $y$ is the denominator = 50

$z$ $z$ is the numerator as a percentage of the denominator = 80%

The algebra:

Divide $x$ $x$ by $y$ $y$ to get $\frac{z}{100}$ $z/100$

$\frac{x}{y} = \frac{z}{100}$ $x/y=z/100$

Multiply $\frac{z}{100}$ $z/100$ by 100 to get $z$ $z$

$\frac{z}{100} \times 100 = z$ $z/100xx100=z$

How it works:

$\frac{40}{50} = \frac{80}{100} = 0.8$ $40/50=80/100=0.8$

$\frac{80}{100} \times 100 = 0.8 \times 100 = 80$ $80/100xx100=0.8xx100=80$

40 is 80% of 50.