Answer the 13th question."DO NOT SEND ANY LINKS".

Q13. A cuboidal block of metal has dimensions 36 cm by 32 cm by 0.25m. It is melted and recast into cubes with an edge of 4 cm. How many such cubes can be made? What is the cost of silver coating the surfaces of the cubes at the rate of Rs.1.25 per square metre?

Dear student,

Volume of a cuboidal block=n×Volume of cubes       --[where n is number of cubes]l×b×h=n×a336cm×32cm×0.25×100cm=n×4cm3 36×32×25=n×64n=36×32×2564n=36×1×252n=18×25n=450 Number of such cubes formed=450Surface area of 1 cube=6a2=6×4×4=96 cm2Surface area of 450 cube=450×96 cm2=43200 cm2Cost of 1 m2 = Rs 1.25Cost of 10000 cm2 = Rs 1.25Cost of 43200 cm2=Rs 43200×1.2510000=Rs 432×12510000=Rs 432×12510000Cost of 43200 cm2=Rs 5.4

  • 1
What are you looking for?