37.5% = 3/8 as a fraction.
So 180 x 8/3 would get you your answer.
Solution: 480
245, if x represents the number of minutes then you use 5 where x would be in the function so 49(5) which is 245 jumping jacks in 5 minutes.
Ramseys change will be $7.50

And thus each friend receives 1 and a half of a potato chip