Question

12. A box made of sheet metal costs rs 6480 at rs 120 per square metre. If the
box is 5 m long and 3 m wide, find its height.​

Answer 1

Answer:

1.5 m

Step-by-step explanation:

Given  

12. A box made of sheet metal costs rs 6480 at rs 120 per square metre. If the box is 5 m long and 3 m wide, find its height.

 We know that

Area of metal sheet = total cost / cost per m^2

                              = 6480 / 120

Now area of metal sheet = 54 m^2

                                        = 2(lb + b h + h l)

                                54 = 2(5 x 3 + 3 x h + h x 5)

                             27 = 15 + 3 h + 5 h

                            27 = 15 + 8 h

Now 8h = 12

So h = 12 / 8 = 3/2

Now h = 1.5 m

Therefore the height of metal sheet is 1.5 m

Answer 2

Answer:

1 A matchbox measures 4 cm x 2.5 cm x 1.5 cm. What is the volume of a packet containing 12 such matchboxes?