← Word problemsWord Problems 005 — Average size of a book collectionWord problemsPracticeMediumYour answera)b)Enter only the number. Use a point or comma for decimals.Check answerReveal solutionStuck? Show me one stepRelated exercisesSimilarZAP 2008, Exercise 6 — Family average weight, find father's weightStatistics 001 — ZAP 2026, Exercise 6: Finding the averageStatistics 002 — Determining an average, part II