Last Updated on May 4, 2023
Let’s first determine the average of 10, 30, and 50, using the average formula.
average = sum/quantity
average = (10+30+50)/3
average = 90/3
average = 30
We can now rephrase the question to ask: “30 is 5 more than the average of 20, 40, and what value?” Let’s label the missing value as n and create an equation.
30 = (20+40+n)/3 + 5
25 = (20+40+n)/3
75 = 60 + n
15 = n
Answer: A
Scott Woodbury-Stewart is the founder & CEO of Target Test Prep. A passionate teacher who is deeply invested in the success of his students, Scott began his career teaching physics, chemistry, math, and biology. Since then, he has spent more than a decade helping students gain entry into the world’s top business schools, logging 10,000+ hours of GMAT, EA, GRE and SAT instruction. Scott also served as lead content developer and curriculum architect for the revolutionary courses Target Test Prep GMAT, Target Test Prep EA, Target Test Prep GRE and Target Test Prep SAT Quant.
