Question

Un calator are de parcurs un drum in 2 zile:in prima zi 75% din drum,iar in a doua zi restul de 85 km.Calculati lungimea drumului,

Answer 1

x-lungimea drumului
ziua 1: 75/100=3/4 din x
ziua 2: 85 km
$\frac{3}{4}x+85=x \\ \frac{1}{4}x=85 \\ x=85*4=340$
deci drumul are 340km

Answer 2

x-lungimea drumului
I zi:   x-75/100=x-3x/4=(4x-3x)/4=x/4
x/4=85
x=85·4
x=340 km lungime adrumului

I zi a stabatut 340x75/100=255 km
340-255=85