Answer:
Volume of a in z = 876 ounces
Explanation:
For z, the ratio of x and y is 3 : 11
x : y = 3 : 11 , which means in 14 parts of solution z : x will be 3 parts and y will be 11 parts
So, in 2520 ounces solution of z ,

Volume of a in z = { Volume of a in x + Volume of b in x }
Therefore,

So, Volume of a in z = 876 ounces