alleryA 15 m × 10 m × 7 m hall's walls and ceiling are painted; a can covers 100 m2. Cans needed?
A5
B7
C4
D6
Answer & Solution
Correct answer: A. 5
1. Walls = 2 × 7 × (15 + 10) = 350 m2.
2. Ceiling = 15 × 10 = 150 m2, so the total is 500 m2.
3. Cans = 500 ÷ 100 = 5.
_Source: NCERT Class 8 Mathematics, Chapter 9 Mensuration, Exercise 9.2_
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