Could someone help me with this question please!

X:y = 5: 3 and x + y = 56
Work out the value of x-y

Aflute is on sale for 20% off. including the discount and 8% tax, the sales price is $216.

Can someone me with this problem . show your work .

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.