An alloy contains a mixture of two metals X and Y in the ratio of 2 : 3. The second alloy contains a mixture of the same metals, X and Y, in the ratio 7 3. In what ratio should the first and the second alloys be mixed so as to make a new alloy containing 50% of metal X?

A

3 : 4

B

3 : 1

C

5 : 6

D

2 : 1