Alloy X contains 70% copper and 30% zinc. Alloy Y contains 40% copper, 25% zinc and 35% aluminum. Alloy X and Y are mixed in the ratio of 1 : 3. What is the ratio of copper and zinc in the newly formed alloy?

A

19 : 33

B

11 : 32

C

38 : 21

D

19 : 21