Question

Ana a mers 3/7 din drum si mai are 10 kilometri pana ajunge la jumatatea drumului. Cati kilometri are drumul ?urgent !

Answer 1

3d/7+10=d/2
3d/7-d/2+10=0
amplificam prima fractie cu 2 si a doua cu  7
6d/14-7d/14+10=0
-d/14+10=0
-d/14=-10
d/14=10 /x14
d=140

Mult spor!