Mihalulusask
a fost răspuns

Stiind ca a/18=b/25 , aflati cate procente reprezinta numarul a din numarul b . 

Răspuns :

Miky93ask
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%
Petrwask
[tex] \frac{a}{18} = \frac{b}{25} [/tex] 

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

 x% ·b=a

[tex] \frac{x}{100} [/tex] · b= [tex] \frac{18b}{25} [/tex] 

[tex] \frac{x}{100} [/tex]= [tex] \frac{18b}{25} [/tex] :b 

[tex] \frac{x}{100} [/tex] = [tex] \frac{18}{25} [/tex]

x= [tex] \frac{100x18}{25} [/tex]

x=72%

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