Which sentence correctly represents the inequality `$4n - 9 > 20$`?

The difference of 4 times a number `n` and 9 is greater than 20.

Four times the difference of a number `n` and 9 is greater than 20.

The difference of 4 times a number `n` and 9 is less than 20.

Nine less than 4 times a number `n` is at most 20.

Which sentence correctly translates the inequality `$3(a - 7) > 21$`?

The difference of 3 times a number `a` and 7 is greater than 21.

Three times the difference of a number `a` and 7 is greater than 21.

Three times a number `a` minus 7 is less than 21.

The sum of 3 and a number `a` minus 7 is greater than 21.