Can anyone me with this question? ?

There are many different paths to take but here is my take

15%:22.5%:48%: 74 3/4        Turn everything into a percent
15%:22.5%:48%: 7475%       Turn into a decimal
.15: .22: .48: 74.75                 Times by 100
15: 22 : 48: 7475                    Covert into factors
5(3) : 2(11) : 3(2⁴): 5²(299)     Relize there is no common factor...
15: 22 : 48: 7475                    < Whole numbers
                      

   15: 22.5: 48: 74 4/3 
= 30: 45: 76: 179 1/2
= 60: 90: 152: 359

20y5 times 2 is 1010 times -2 is -20, plus y