45-24 /4(3)=?

multiple and divide has precedence to sum and minus and between multiple and divide we start from left.
45-24 /4(3)=? => 45-6(3) = 45-18 = 27

Remember BIMDAS

45-24/4(3)
= 45 - (24/4)x(3)
= 45 - (6)x(3)
= 45 - 18
= 27

Order of precidence:
Brackets, Indices, Multiplication/Division, Addidtion/Subtraction

If it is 45-(24 /4(3))
then the answer wil be 45-2=43

if it is (45-24) /4(3)
then the answer will be 21/12=7/4=1.75

43.

45-24/12 => 45-2 = 43.

1.75

Could be read in a number of ways.
Will assume :-
45 - 24 / 12
45 - 2
43

PS
Brackets must be used to ensure that question can be read in ONE way only.
The question as given can be read in MANY ways,

(45 - 24)/4(3)
= 21/12
= 7/4
= 1.75

PEMDAS
1st) -24/4= -6
2)-6(3)= -18
45-18=27

21/12=1.75