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CBSE Class 9 Answered

the paint in a certain is sufficient to paint an area equal to 5.25 m sq. How many closed rectangular boxes of dimensions 27.5 cm *16 cm *10 cm can be painted out of this container?  
Asked by harmeetc405 | 30 Dec, 2018, 07:40: PM
answered-by-expert Expert Answer
It is assume that only outer surfaces of rectangular boxes are to be painted.
 
area that can be painted = 5.25 sq.m = 5.25×100×100 sq.cm
 
total surface area of one rectangular box = 2(27.5×16 + 16×10 + 10×27.5) sq.cm = 1750 sq.cm
 
no. of boxes that can be painted = begin mathsize 12px style fraction numerator 5.25 cross times 100 cross times 100 over denominator 1750 end fraction space equals space 30 end style
Answered by Thiyagarajan K | 31 Dec, 2018, 12:00: PM

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