question_answer

Mrs. Razdan wants to use tiles of length 20 cm and breadth 10 cm to cover the floor of her balcony shown in the figure. What is the area of balcony? How many tiles does she need to buy\[(1\,\,Sqm=10,000\,\,Sq.\,\,cm)\]?  

A)  20 Sq.m, 1000 tiles       

B)  30 Sq.m, 2000 tiles

C)  40 Sq.m, 5000 tiles       

D)  50 Sq.m, 2000 tiles

Correct Answer: A

Solution :

Area of ABCD\[=2\,\,m\times 4\,\,m=8\,\,{{m}^{2}}\] Area of DEFG\[=6\,\,m\times 2\,\,m=12\,\,{{m}^{2}}\] Total Area\[=(8+12){{m}^{2}}=20\,\,{{m}^{2}}\] Tiles area\[=\frac{20\times 10}{10000}{{m}^{2}}=\frac{2}{100}{{m}^{2}}\] No. of tiles\[=\frac{20\times 100}{2}=1000\,\,\text{tiles}\]