Which operation should be performed first according to the order of operations?

44 • 2 - [ (5 + 20 • 3) - 12] + 16 : 2

The first thing that should be done is parentheses.

So pemsas

parenthasees

exponents

multiplication or division

additon or subtraction so

inner to outer

the first one is (5+20 times 3)

but within, it is multiplication so first is 20 times 3 so

5+60

add

65

then subtration

65-12=43

then go to the front sice no more parenthasees

44 imes 2

88

then the other division

16/=8

addition

88-43+8

37

answer is 7

first one is 20 times 3