Answer:
17
Step-by-step explanation:
Rember BODMAS. This rule states that one must work out what is in brackets first thus:
→40 - ( 43 - 20 )
→40 - 23 ( first work what is in brackets : 43 - 20 which is 23)
→ 17 ( 40 - 23 is 17 )
HOPE THIS HELPED
