Mathematics
NULL
Medium
Question
A cistern of capacity 8000 litres measures externally 3.3 m × 2.6 m × 1.1 m and its walls are 5 cm thick. The thickness of the bottom is __________?
A
90 cm
B
1 dm
✓ Official correct answer
C
1 m
D
1.1 cm
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A
90 cm
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B
1 dm
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C
1 m
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D
1.1 cm
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Explanation
Inner base 3.2 m × 2.5 m; capacity 8 m³ ⇒ inner height = 1 m. Bottom thickness = 1.1 − 1 = 0.1 m = 1 dm.