Answer:
Explanation:
The fact that Kalen earned a 75% means that 6 questions are 75% of the total number of questions. And for a moment, if we call T the total number of questions, then we know that

which simplifies to

Dividing both sides by 0.75 gives



Hence, the total number of questions on the test was 8.
In short, the formula for solving such problems is

where number is that which is some percent of the original amount.