# RD Sharma Solutions Class 6 Mathematics Solutions for Mensuration Exercise 20.4 in Chapter 19 - Mensuration

Question 12 Mensuration Exercise 20.4

A marble tile measures 10 cm × 12 cm. How many tiles will be required to cover a wall of size 3 m ×4m? Also, find the total cost of the tiles at the rate of Rs 2 per tile.

Measure of marble tile = 10 cm × 12 cm

Size of the wall = 3 m × 4 m = 300 cm × 400 cm

So the area of marble tile = 10 cm × 12 cm = 120 cm²

Area of wall = 300 cm × 400 cm = 120000 cm²

No. of tiles required to cover the wall = Area of wall/ Area of one tile

Substituting the values

No. of tiles required to cover the wall = 120000/120 = 1000 tiles

It is given that

Cost of one tile = Rs 2

So the cost of 1000 tiles = 1000 × 2 = Rs 2000

Hence, 1000 number of tiles are required to cover the wall and the cost is Rs 2000.

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