Good question. I has chosen the 1st choice only because I found 25 and I have read 25th May = Memorial Day only on last week.

If I have got this information , I would choose 24 as it is the now day.

My method :

1 ==> (((5+20*20-70+65)/16)*12) - 275 = 25 ( day in a month + memorial Day )

2 ==> ( ( 25 * 10 )+ ( 6 / 25 ) ) - 6 = 244 ( not a day in a month )

3 ==> ( 25 + 10 ) - ( 10 * ( 2%2 ) ) = 35 ( not a day in a month )

4 ==> ((1024 * 16 ) - ( 1024 / 15 ) ) /599 = 27 ( day in a month but why 27 is important ? )

Nota : as I am not sure for the operators precedence I prefer always to surround my operations with () so I am avoiding errors.

I have not used multiple T-SQL operators in a mathematical expression since 2 years , so when I chose the 1st choice , I was glad.