((100-45)+40+25):5=10 (100-(45+40)+25):5=20 (100-45+(40+25)):5=42 (100-((45+40)+25)):5=78 (100-45+(40+25)):5=100
((100-45)+40+25):5=10
(100-(45+40)+25):5=20
(100-45+(40+25)):5=42
(100-((45+40)+25)):5=78
(100-45+(40+25)):5=100