The ratio of zinc to copper in metal alloy A is 7 : 11 and in metal alloy B is 16 : 25.

By changing each ratio to the form 1 : m, which alloy has the greater proportion of copper.

A

Step-by-step explanation:

You first want to simplify the proportions:

7:11 becomes 1:11/7

16:25 becomes 1:25/16

Now you find the LCM of the denominators of the copper which is 112 and that gets us to:

176/112 and 175/112

you see the numerator of the first one is bigger so the number is bigger so the awnser is A