180 is the answer . Just multiply both numbers.
Take the .5 of the 17.5 and convert it to a fractin.
we know .5 is equal to 50% or 1/2
now we have a mixed number

in order to convert it into an improper fraction you need to multiply the whole number by the denominator and then add the numerator all while keeping the denominator constant.

so
I believe it's the 3rd one. It's a really tricky question sorry if you get it wrong