Question

Marian a parcurs cu bicicleta un traseu astfel:luni a parcurs 25% din traseu,marti a parcurs 40% din rest iar miercuri a parcurs ultimii 81 km.Aflati lungimea totala a traseului.

Answer 1

x - lungimea
25/100 * x = x/4 luni
x-x/4=3x/4 dupa prima zi
40/100*3x/4=3x/10 marti
x/4-3x/10=9x/20 km ramasi


9x/20=81 => x=1620/9=180

Answer 2

Luni :25/100*x=1/4*x=x/4
Marti :40/100*(x-x/4)=4/10*(4x/x-x/4)=2/5*3x/4=6x/20=3x/10
Miercuri : 81 


x-x/4-3x/10=20x/20-5x/20-6x/20=15x/20-6x/20=9x/20

9x/20=81
9x=1620

x=180


Sper ca te-am ajutat ! :D