1/16
multiples 15,30,45,60, and 75 making 5/80 then you simplify to 1/16
I believe its 180.
I have seen this question before and the amount of girls was 220, so 400-220 is 180
Hope this helps :)
-10 and 2
-10 x 2 = -20
-10 + 2 = -8
Remember

so

take the log of both sides

or

B is the answer