Considering below equation holds
V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30
Then, I + II + III = ?
V+II-VI=(5+2-6)=1 and then place zero at units digit =10
similarly, IV-X+VIII=(4-10+8)=2 then placed zero at unit digit = 20
IV-VII+VI=(4-7+6)=3 place zero at units digit =30
I+II+III=(1+2+3)=6 place zero at units digit.= 60