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a fost răspuns

un automobil parcurge o distanta in 3 zile astfel in prima zi ,25% din intreaga distanta in a doua zi parcurge 70% din rest .Stiind ca in ultima zi parcurge 360 km.Calculati lungimea intregii distante.

Răspuns :

Meryistrate
notam cu x distanta
I=25/100x
ll=70/100(x-25/100x)=70/100(100x-25x/100)=70/100*75/100x=525/1000x
lll=360
l+ll+lll=x
25/100x+525/1000x+360=x
aducem la acelasi numitor
250x+525x+360000=1000x
775x-1000x=-360000
-225x=-360000
x=360000/225
x=1600