the cost of carpeting a room 18 m long with carpet 75..., Area, General Mathematics

Question:The cost of carpeting a room 18 m long with a carpet 75 cm wide at 45 paise per metre is Rs. 81. The breadth of the room is :

A 7 m 
B 7.5 m 
C 8 m 
D 8.5 m

/98

+ AnswerB

+ ExplanationLength of the carpet` = (Total Cost/Rate/m)`

                                ` = (8100/450) m`

                              ` = 180 m`

Area of the room` = (180 xx 75/100) m^2`

                          ` = 135 m^2`

:. Area of the room` = Area of the carpet = 135 m^2`

:. Breadth of the room` = (Area/Length)`

                                  ` = (135/18) m^2`

                                ` = 7.5 m.`

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