Question

A can of paint contains 1000ml of certain paint, which is sufficient for painting an area of 10 m2. How many cans will be sufficient to paint a rectangular wall on one side which is 10m long and 7m high.​

Answer 1

Given:
⇒Area=9.375m
2


⇒22.5cm×10cm×7.5cm=l×b×h

⇒Total surface of cuboid (brick) =2(lb+bh+lh)

⇒2(22.5×10+10×7.5+22.5×7.5) cm
2


=2×468.75=937.5 cm
2


⇒Area that can be painted by part of container =93750 cm
2


⇒Let x number of bricks will be used.

⇒Area =937.5×x cm
2


⇒x=
937.5
93750
​


⇒x=100

Answer 2

Answer

Given:

⇒Area=9.375m  

2

 

⇒22.5cm×10cm×7.5cm=l×b×h

⇒Total surface of cuboid (brick) =2(lb+bh+lh)

⇒2(22.5×10+10×7.5+22.5×7.5) cm  

2

 

=2×468.75=937.5 cm  

2

 

⇒Area that can be painted by part of container =93750 cm  

2

 

⇒Let x number of bricks will be used.

⇒Area =937.5×x cm  

2

 

⇒x=  

937.5

93750

​  

 

⇒x=100