Question

Un biciclist a parcurs in prima zi 3 supra 5 dintr-un drum,iar in a doua zi restul de 30km.Cati km are drumul ?

Answer 1

$\frac{5}{5} - \frac{3}{5} = \frac{2}{5}$

$\frac{2}{5} =30km$

$\frac{1}{5} =30 : 2= 15km$

15 x 5 =75 km

Answer 2

x-lungimea drumului

3/5 din x= 3/5 * x=  3x/5 -in 1a zi

x- 3x/5= (5x-3x)/5=  2x/5-restul

2x/5=30

x=5*30/2
x=5*15
x=75