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For The Mathematically Inclined

Anil Saigal

Problem 1:
How  many kilograms of iron  is needed for production 50 pieces of  hollow pipes with the inner and outer diameters of 12 and 16 cms and length of 4 m? Assume the density of iron used is 7800kg/m3.

Problem 2:
From an iron cube of edge 37 cm,a maximum cylinder is lathed. Hom mmany kilograms of iron is wasted? Assume the density of iron used is 7800kg/m3.


Please send your solutions anil@lokvani.com. 

Use Problem Solutions M-101118 as the subject line. Please include your full name in the text of the main message. Everyone with the right answer will be acknowledged in the next issue of Lokvani. 

Please do not post your solution in Post Comments. No credit will be given for solutions not sent to anil@lokvani.com. 

If you need clarification on any problem, please contact anil@lokvani.com. 

Problems from 09/27/18

Problem 1:
How many ml 30% of peroxide (H2O2) should be poured into 100ml H2O to give a 20% solution?

Problem 2:
If you mix 41 liters of water with temperature of 43 °C, 53 liters warm of 76 °C and 75 liters water of 40 °C. What is the temperature of the mixed water immediately after mixing?

Congratulations to Ramachandran Balakrishna who was the winner of the last set of puzzles.

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