Question

un calator are de parcurs 244 km in 3 zile. in a doua zi a parcurs 18 km mai putin decat in prima zi iar in a treia zi a parcurs ultimi 64 km. ce distanta a parcurs calatorul in prima zi?

Answer 1

$x+y+z=244 \\\\ y=x-18 \\\\ z=64 \\\\ x+y+64=244 \\\\ x+x-18=244-64 \\\\ 2x-18= 180 \\\\ 2x=180+18 \\\\ 2x=198 \ |:2 \\\\ \boxed{\boxed{x=99}} \\\\ y=99-18 \\\\ \boxed{\boxed{y=81}}$