The difference of two numbers is 8. When twice the first number is added to three times the second number, the result is 51. What are the two numbers?

A.
12 and 4
B.
15 and 7
C.
20 and 12
D.
23 and 15

You are choosing between two health clubs. club a offers membership for a fee of $ 28 plus a monthly fee of $ 20. club b offers membership for a fee of $ 20 plus a monthly fee of $ 22. after how many months will the total cost of each health club be the same? what will be the total cost for each club? in __ months the total cost of each health club will be the same.