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A person of mass 60 kg wants to lose 5 kg by going up and down a 10 m high stairs. Assume he burns twice as much fat while going up than coming down. If 1 kg of fat is burnt on expending 7000 kilo calories, how many times must he go up and down to reduce his weight by 5 kg ?

Answer» <html><body><p></p>Solution :Height of the stairs <a href="https://interviewquestions.tuteehub.com/tag/h-1014193" style="font-weight:bold;" target="_blank" title="Click to know more about H">H</a> = 10 m <br/>Work done to burn 1 kg of fat = <a href="https://interviewquestions.tuteehub.com/tag/7000brbr-1917317" style="font-weight:bold;" target="_blank" title="Click to know more about 7000">7000</a> <a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a> cal <br/>`therefore` Work done to burn 5 kg of fat<br/> =5 x 7000 = 35000 k cal <br/> Work done towards burning of fat in up and down the stairs, <br/> `=mgh+1/2mgh` <br/> `=3/2mgh` <br/> `=3/2xx60xx10xx10` <br/> =9000 J <br/> `=9000xx1/4.2` cal <br/> =2142.85 cal <br/> `therefore` For energy of 2142.85 cal one trip (up and down) of stairs needed <br/> Hence , for energy of `35xx10^6` cal <a href="https://interviewquestions.tuteehub.com/tag/n-568463" style="font-weight:bold;" target="_blank" title="Click to know more about N">N</a> trip (up and down) of stairs needed. <br/> `therefore n=(35xx10^6)/(2142.85)=0.01633xx10^6` <br/> =16330 <a href="https://interviewquestions.tuteehub.com/tag/times-1420471" style="font-weight:bold;" target="_blank" title="Click to know more about TIMES">TIMES</a></body></html>


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