Atennis player lands 25 out of 40 first serves in bounds for a success rate of 62.5%. how many more consecutive first serves must she land in bounds to increase her success rate to 70%.

She will need to make 10 more consecutive first serves until the number of serves in out of the total number of serves is equal to 70%.

Start with 25/40, then 26/41, 27/42, 28/43, 29/44, 30/45, 31/46, 32/47, 33/48, 34/49, 35/50 (70%).

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.