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ISEE Middle Level Quantitative Reasoning · Question of the Day

ISEE Middle Level Quantitative Reasoning Question of the Day

A fresh daily question to build accuracy, reinforce recall, and turn practice into a steady habit.
Tuesday, September 8, 2026

To earn a B in her science class, Maya needs a four-test average of at least 80%. Her scores on the first three tests were 0.76, 7/10, and 85%. What is the lowest score she can get on her fourth test, expressed as a percentage, to earn a B?

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Question of the Day

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To earn a B in her science class, Maya needs a four-test average of at least 80%. Her scores on the first three tests were 0.76, 7/10, and 85%. What is the lowest score she can get on her fourth test, expressed as a percentage, to earn a B?

  1. 89% (correct answer)
  2. 85%
  3. 92%
  4. 80%

Explanation: First, convert all scores to percentages: 0.76=76%0.76 = 76\%; 7/10=0.7=70%7/10 = 0.7 = 70\%; 85%85\% is already a percentage. To have an average of 80% on four tests, the sum of the scores must be at least 4×80%=320%4 \times 80\% = 320\%. The sum of her first three scores is 76%+70%+85%=231%76\% + 70\% + 85\% = 231\%. Let the fourth score be x. Then 231%+x≥320%231\% + x \ge 320\%. Subtracting 231% from both sides gives x≥89%x \ge 89\%. The lowest score she can get is 89%.