Wrong type of question in Quiz JS

Question

Some of questions has wrong type like this one :
Fill the blank to output 27 in paragraph.
<p id="sample"></p>
<script>
var x = 20;
// line
x 7 ; document.getElementById("sample").innerHTML = x;
</script>

NB : I fill some blank to be more clear.
In Quiz JS The author of question mark just one solution to the blanks under line comment it is x +=7;
But I have another solution with same number of blanks
x =27 too easy but the PB it mark wrong

Answer 1

Yes Dayve both are correct that is why i said wrong type of question depending of rules question fill blanks you must to be sure only one solution

Answer 2

Those are the two methods we can apply. The quiz creator chose the increment one, so you have to go with it.

P.S. Both are correct!