New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    To build a wall that measures 4 meters in length, 4.5

    meters in height, and 20 cm in thickness, how many bricks will be required if each brick is 30 cm long, 10 cm wide, and 16 cm high?
    A 750 Correct Answer Incorrect Answer
    B 765 Correct Answer Incorrect Answer
    C 650 Correct Answer Incorrect Answer
    D 555 Correct Answer Incorrect Answer

    Solution

    Let the number of bricks needed be 'n' ATQ: Volume of the wall = n X volume of each brick Using, volume a cuboid = Length X Breadth X Height (Since, wall and brick both are in shape of cuboid) 400 X 450 X 20 = n X (30 X 10 X 16) Or, 'n' = {(400 X 450 X 20)/(30 X 10 X 16)} Or, 'n' = 750 So, required number of bricks needed = 750

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