Question

Dupa ce a parcurs 3/10 dintr-un drum , un biciclist mai are e parcurs 7 km .
Cati km are drumul ?
va rog frumos ajutati -ma
.

Answer 1

x-drum total
parcurs- 3/10 din drum =3/10*x=3x/10
ramas-7km
x=?

x-3x/10=7km

Answer 2

Notam d=lungimea drumului (in km)

d - $\frac{3}{10} *d$=7 km

$\frac{7}{10} *d$=7

d=7:$\frac{7}{10}$

d=7*$\frac{10}{7}$

d=10 km