Question

300+{120-3×[(4+6÷2)-(3+5-12)]}

Answer 1

300+{120-3×[(4+6÷2)-(3+5-12)]}
300+{120-3×[10÷2]-[8+12]}
300+{120-3×5-20}
300+117×5-20
417×5-20
2085-20=65