Multiple choice

Mariya is an artist and is very precise about her inventory to be used in assignments. She undertakes the work of colouring the bricks, which are to be used for building a wall. She decides to use a bucket of paint which has sufficient paint to colour 8.9 square metre of area. How many bricks of dimensions 55 cm, 20 cm and 15 cm will she paint regardless the total bricks available, if she decides to use only the fixed amount of paint available with her?

  1. 17

  2. 18

  3. 19

  4. 20

  5. Na
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Surface area of one brick = 2 * (55*20 + 20*15 + 55*15) = 2 * (1100 + 300 + 825) = 2 * 2225 = 4450 cm^2 = 0.445 m^2. Number of bricks = 8.9 / 0.445 = 20.

Keep practicing — related questions