Question

A wooden bookshelf has external dimensions as follows Height -110 cm , Depth -25 cm, breadth-85 cm, the thickness of planks is 5cm everywhere. The external faces to be polished and the inner faces are to be painted . If the rate of polishing is 20 paise per square CM the rate of painting is 10 paise square CM.3Total expenses will be​

Answer 1

Answer:

follows Height -110 cm , Depth -25 cm, breadth-85 cm, the thickness of planks is 5cm everywhere. The external faces to be polished andA wooden bookshelf has external dimensions as follows Height -110 cm , Depth -25 cm, breadth-85 cm, the thickness of planks is 5cm everywhere. The external faces to be polished and the inner faces are to be painted . If the rate of polishing is 20 paise per square CM the rate of painting is 10 paise square CM.3Total expenses will be

Step-by-step explanation:

A wooden bookshelf has external dimensions as follows Height -110 cm , Depth -25 cm, breadth-85 cm, the thickness of planks is 5cm everywhere. The external faces to be polished and the inner faces are to be painted . If the rate of polishing is 20 paise per square CM the rate of painting is 10 paise square CM.3Total expenses will beA wooden bookshelf has external dimensions as follows Height -110 cm , Depth -25 cm, breadth-85 cm, the thickness of planks is 5cm everywhere. The external faces to be polished and the inner faces are to be painted . If the rate of polishing is 20 paise per square CM the rate of painting is 10 paise square CM.3Total expenses will be

Answer 2

Answer:

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External length (l) of bookshelf=85㎝

External breadth (b) of bookshelf=25㎝

External height (h) of bookshelf=110㎝

External surface area of book shelf while leaving out the front face of the shelf=lh+2(lb+bh)

=(85×110)+2(85×25+25×110)

=9350+9750

=19100㎠

Area if front face=(85×110)−75×100+2(75×5)

=1850+760=2600㎠

Area to be polished=19100+2600=21700㎠

Cost of polishing=Rs. 21700×0.20=Rs.4340

Length, breadth and height of each row of bookshelf are

75㎝,20㎝ & 30㎝ respectively. From the figure Area to be painted in 1 row=2(l+h)b+lh

=2(75+30)20+75×30

=6450㎠

Area to be painted in 3 rows=3×6450=19350㎠

Total cost of painting=Rs.(19350×0.1)=Rs. 1935

Total expenses=Rs.

(4340+1935)=Rs. 6275(4340+1935)=Rs.6275

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