Răspunsuri

2014-09-08T14:57:39+03:00
Pai inseamna ca sunt 15% studenti deci: 15/100*x=6⇒15x=600⇒x=40 de persoane in total
80/100*40= 32 elevi
5/100*40= 2 profesori

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2014-09-08T14:58:06+03:00
X-nr de persoane din excursie

80% din x=  80/100 * x=  8/10 *x= 4/5 *x=  4x/5 -elevi

5% din x= 5/100 * x= 1/20 * x=  x/20 - profesori

4x/5 +x/20 + 6=x

16x+x+120=20x

17x+120=20x

17x-20x= -120

-3x=-120

3x=120

x=40

4*40/5=  4*8=32 -elevi

40/20=2 - profesori
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