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A student scores 60, 70 and 80 in three tests. What must be scored in a fourth test to average 75?

Correct answer: B. 90

  • A. 85
  • B. 90
  • C. 95
  • D. 80

Explanation

An average of 75 over four tests needs a total of 300, and the first three sum to 210, so the fourth must be 90. Working from the required total rather than adjusting the average directly is the safer method. The answer exceeds 75 because the earlier scores pulled the average down.

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About Logical Problems

Logical problems present several conditions about people, objects, events or choices and require their possible arrangements to be tested. They cover constraint-based reasoning, rankings, matching, grouping, scheduling and elimination, with attention to the difference between a complete solution and a possibility that merely satisfies one condition.

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