Question

# A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:

A

90 cm

B

1 dm

C

1 m

D

0.9 m

Solution

## The correct option is B 1 dm Let the thickness of the bottom b `x' cm Then, [(330 -- 10) × (260 -- 10) × (110 - x) = 8000 ×1000 ⇔ 320 × 250 × (110 -- x) = 8000 × 1000 ⇔ (110 -- x) = 8000×1000320×250 = 100 ⇔ x = 10 cm = 1 dm

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