Question

I need your help because I don’t understand

Answer 1

Alright, so first divide 20 km by 1.2 cm

16.6666666667

Multiply 16.6666666667 by 9

150

So it's 150 km!

Hope this helps!

Answer 2

$\frac{1.2}{20} = \frac{9}{x}$
Then you would cross mutiply and you would get
$1.2x = 180$
Then you divide each side by 1.2
$(1.2x) \div 1.2 = (180) \div 1.2$
Then you solve and get
$x = 150$