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ML Aggarwal Solutions Class 8 Mathematics Solutions for Mensuration Exercise 18.4 in Chapter 18 - Mensuration
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A cuboidal fish tank has a length of 30 cm, a breadth of 20 cm, and a height of 20 cm. The tank is placed on a horizontal table and it is three-quarters full of water. Find the area of the tank which is in contact with water.
Answer:
Given,
Length of tank = 30 cm
Breadth of tank = 20 cm
Height of tank = 20 cm
As the tank is three-quarters full of water
So, the height of water in the tank = (20 x 3)/4 = 15 cm
Hence,
Area of the tank in contact with the water = Area of the floor of Tank + Area of 4 walls up to 15 cm
= 30 × 20 + 2 (30 + 20) × 15
= 600 + 2 × 50 × 15
= 600 + 1500 = 2100 cm2
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