Going through the checklist: B= Brackets (there are no brackets) I=Indices (there are no powers) D= Division (there is no division) M= Multiplication. we have a times sign in this problem between the 3 and the 7. As 3x7=21 we can write the problem as 2+5+21 A=Addition. We have addition in this puzzle. As 2+3=5, and 5+21=26, our answer is 26!