Question

a door length 1 m and breadth 0.5 m is on a wall the length of the wall is 4.5 m and breadth is 3.6 m find the cost of white washing the wall at the rate of rs 20 per sq.m

Answer 1

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ANSWER

Area of rectangular door=length×breadth=2m×1m=2m

2

Area of wall including door=length×breadth=4.5m×3.6m=16.2m

2

Now, Area of wall excluding door

=Area of wall including door−Area of door

=16.2−2=14.2m

2

Since, The rate of white washing of 1m

2

the wall=Rs. 20

Therefore, the rate of white washing of 14.2m

2

the wall=20×14.2

=Rs. 284

Thus, the cost of white washing the wall excluding the door is Rs. 284.

Answer 2

Step-by-step explanation:

Area of the door= l*b

                           = 1*0.5 = 0.5 sq.m.

Area of the wall= l*b

                          =4.5*3.6 = 16.2 sq.m.

Area of white washing= area of wall- area of the door

                                    = 16.2-0.5 =15.7 sq.m.

Cost of white washing per sq.m= 20 Rs.

Cost of white washing for 15.7 sq.m.=20*15.7

                                                            = 314 Rs.