Nomor 11-15, beserta caranya

14. 60/60-3-3=80/80-3-x
60/54=80/77-x
60(77-x)=80.54
4620-60x=4320
4620-4320=60x
300=60x,
x=300/60=5cmD
11. 6m=600cm
9m=900cm
600/120=900/x
120 kali 900=600 kali x
108000=600 x
x=108000/600=180cmD
*x=tinggi SANDI