2. Questions Bank
  3. 7th Class
  4. Mathematics
  5. Perimeter and Area

7th Class Mathematics Perimeter and Area Question Bank Perimeter and Area

  • question_answer
    A floor measuring 2 m by \[1.5\text{ }m\]is to be covered with tiles measuring\[25\text{ }cm\times 25\text{ }cm\]. Find the number of tiles required to cover the floor and the cost of the tiles at Rs. 420 per dozen.

    A)  24, Rs.1380               

    B)  48, Rs. 1680

    C)         48, Rs.1285     

    D)         24, Rs.2000

    Correct Answer: B

    Solution :

            Number of tiles required =               \[\frac{Area\text{ }of\text{ }rectangular\text{ }floor}{Area\text{ }of\text{ }each\text{ }tile}\] \[=\frac{200\times 150}{25\times 25}=48\] Cost of 12 tiles =Rs. 420                    So, cost of 1 tile \[=Rs.\,\frac{420}{12}=Rs.35\] Cost of 48 tiles \[=Rs.(35\times 48)=Rs.1680\]


You need to login to perform this action.
You will be redirected in 3 sec spinner