Răspuns :
x- 75x/100= 30 =>amplificam cu 100
100x- 75x= 3000
25x= 3000
x= 3000/25
x= 120 km are drumul
100x- 75x= 3000
25x= 3000
x= 3000/25
x= 120 km are drumul
75%×30=75/100×30
=2250/100
=2250÷50/100÷50 (impartim cu 50)
=45/2
=22,5(lungimea drumului)
=2250/100
=2250÷50/100÷50 (impartim cu 50)
=45/2
=22,5(lungimea drumului)