PSLE Math 2021 Paper 2 Question 3

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(Kelvin Shelves Question)

PSLE Math 2021 Paper 2 Question 3

Handwritten notes with a diagram of a bookshelf, calculations related to volume and number of books, and annotations in blue ink on lined paper.

Ans: 11

30L = 45s
1 L = 45 ÷ 30 = 1.5s
3L = 1.5 × 3 = 4.5s
45s - 23s - 4.5s = 17.5s

17.5s÷1.5=11/23 ≈11