Question

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Answer 1

20%+25%80%+9=x(drumul) 20%+20%+9=x 40%+9=x 9....60% Y....20% y-prima zi Y=20×9÷60 Y=3km

Answer 2

x=drumul

$\frac{20}{100} * x + \frac{25}{100} * (x - \frac{20}{100} *x) + 9 = x$

Simplificand fratia de mai sus obtin:
$\frac{x}{5} + \frac{1}{4} (x- \frac{x}{5} ) + 9 = x$
$\frac{x}{5} + \frac{x}{4} - \frac{x}{20} + 9 = x$

Aducand fractia la acelasi numitor (20) si simplificand-o, obtin:

4x+5x-x-20x=-9*20
8x-20x=-180
-12x=-180 => x=15km

In prima zi, ciclistul a parcus $\frac{20}{100} * x = \frac{1}{5} *x= \frac{x} {5} = \frac{15}{5} = 3$