Answer :

4 X 5 = 20.  20 + 3 = 23.  12 / 23 = 0.5217391304.  You could round this to 2 decimal points to get 0.52.  
So 12/3+4x5
By BODMAS...
3 + 4 x 5
multiplication first so 4 x 5 = 20
= 25
12/23 = 0.52... to 2 decimal places 

Hope that helped.

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