va rog repede dau coroana

Răspuns:
Aflați x din proportia:
x/7=5/14=>7×5/14=35/14=2,5
x-1/12=5/3=>12×5/3=60/3=20
7/5=y/30=>7×30/5=210/5=42
a/2=7/6=>2×7/6=14/6=2,(3)