Tachs Math · Question of the Day

Tachs Math Question of the Day

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

Tuesday, September 15, 2026

The table below shows the number of books read by 6 students during a summer reading program. The mean number of books read is 12. What is the value of $x$ ?

$Tachs Math question graphic$

Keep practicing Tachs Math

Question of the Day

Answer today's Tachs Math question, reveal the full explanation, then keep the streak going with a new question every day.

The table below shows the number of books read by 6 students during a summer reading program. The mean number of books read is 12. What is the value of $x$ ?

$10$
$14$
$16$
$18$ (correct answer)

Explanation: Total books = $12 \times 6 = 72$ . Sum of known values: $8 + 15 + 9 + 10 + 12 = 54$ . So $x = 72 - 54 = 18$ . Distractor A comes from averaging only the 5 known values incorrectly. Distractor B comes from using 5 students instead of 6. Distractor C comes from using a mean of 11.