Answer:
2/3
Explanation:
There are a total of 84 questions, but Adam only got 56 of them correct. So, we have the fraction 56/84.
We want to simplify this, so determine the greatest common factor (GCF) of 56 and 84 by prime factorising each of them:
56 = 2 * 2 * 2 * 7
84 = 2 * 2 * 3 * 7
Notice that they share 2 * 2 * 7 = 28. So, divide both the numerator and denominator of 56/84 by 28:
56 ÷ 28 = 2
84 ÷ 28 = 3
The answer is 2/3.
Hope this helps!