Answer:
70 points
Step-by-step explanation:
Let n represent Noah's score, m as Maya's score, and c as Claire's score.
n=20
m=30
c=?
Let's try make an equation for this problem. The mean score for the three of them is 40, so the following equation is possible:
n+m+c/3=40
Now replace the variable with their values and continue to simplify.
20+30+c/3=40
Multiply both sides by 3.
20+30+c=120
Add 20 and 30 together.
50+c=120
Subtract 50 from 120 to find c.
c=70
Claire's score is 70 points.
