Răspunsuri

2014-07-05T14:08:07+03:00
A/18=b/25

a=18b/25

p%  din b= a

p/100 * b=  18b/25

p/100=18b/25/b

p/100=18b/25 * 1/b

p/100= 18/25

p=100*18/25

p=4*18

p=72%
2014-07-05T14:52:55+03:00
 \frac{a}{18} =  \frac{b}{25}  

facand produsul mezilor si al extemilor ⇒ a= \frac{18b}{25}

 x% ·b=a

 \frac{x}{100}  · b=  \frac{18b}{25}  

 \frac{x}{100}  \frac{18b}{25} :b 

 \frac{x}{100}  \frac{18}{25}

x=  \frac{100x18}{25}

x=72%
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