Daryl is twice as old as kathlyn. In 6 years he will be four times as old as she was 3 years ago. Find their present age

"Daryl = 2 times as Kathryn
D = 2K

D + 6 = 4(K - 3)
2K + 6 = 4K - 12
2K - 4K = - 12 - 6
-2K = - 18
K = 9 present age of Karhryn
D = 18 present age of Daryl"