64 children attended a computer course. 5/8 of them were girls. how many more girls than boys were there?

If the total is 64, to calculate the girls, just multiply 64 by 5/8, and you get 40 girls. so the number of boys is actually 8-5/8, which is 3/8, so in total there r 24 boys.
so 40 - 24 makes there r 16 more girls

There were a total of 28 more girls than boys.

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.