# ML Aggarwal Solutions Class 8 Mathematics Solutions for Mensuration Exercise 18.4 in Chapter 18 - Mensuration

Question 7 Mensuration Exercise 18.4

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.

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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