Răspuns :
a=3*n
n=a-150
a+n=?
a I-------I-------I-------I
n I-------I.....150.......I
n=150:2=75
a=75*3=225
225+75=300
n=a-150
a+n=?
a I-------I-------I-------I
n I-------I.....150.......I
n=150:2=75
a=75*3=225
225+75=300