Note that $$(0.3+0.4+0.5 -0.9)\div0.6 =(1.2 -0.9)\div0.6 =0.3\div0.6 = 3\div6$$ $$=0.5$$. 
Which of these is equal to $$(0.3+0.4 + 0.5 -0.9)\div0.6$$? 
Options:
1) $$0.02 $$ 
2) $$0.05 $$ 
3) $$0.2 $$ 
4) $$0.5$$ 
5) $$1$$ 