Question

find the cost of painting a wall of 15m long 10m wide,if the cost of painting is rs 50 per 100 sq. m​

Answer 1

Answer:

Length of the wall of a room = 10m

The breadth of the wall of a room = 5m

Height of the wall of a room = 6m

The cost of painting per sq m is Rs.4

To Find

The cost of painting 4 walls of a room

Solution:

Area of 4 walls = 2( length + breadth)height

                        = 2( 10 + 5)×6

                        = 2×15×6 m²

                        = 180 m²

Cost of painting 4 walls = Area of the wall× cost of painting

                                      = 180 m² × Rs.4/m²

                                      = Rs. 720

Therefore, the cost of painting 4 walls of a room is Rs.720.

Step-by-step explanation:

Answer 2

Answer:   ₹ 75

Step-by-step explanation:

Area of wall = length × breadth

Area of wall = 15 × 10

                    = 150 $m^{2}$

Cost of painting 100 $m^{2}$ = ₹ 50

Cost of painting 1 $m^{2}$ = ₹ $\frac{50}{100}$  = ₹ 1/2

Cost of painting 150 $m^{2}$ = ₹ $\frac{1}{2}$ × $150$

                                       =  ₹ 75