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CBSE Class 7 Answered

<div>Respected mam/sir,</div> <div>Kindly explain me this word problem as follows:</div> <div><strong>In a well there are 800 liters of water. At the top there is a pipe that deposits 25 liters per minute into the well, and at the bottom there is another pipe which withdraws 30 liters per minute from the same well. how many liters of water will be there in the well after 15 minutes of the pipes functioning?</strong></div>
Asked by ranksahoo | 16 Jun, 2017, 07:59: PM
Expert Answer
begin mathsize 16px style Water space in space straight a space well equals 800 space litres
Water space deposited space left parenthesis coming space in right parenthesis space in space well space in space one space minute equals 25 space litres
Water space withdrawn space left parenthesis going space out right parenthesis space from space well space in space one space minute equals 30 space litres
Then comma space water space left space in space straight a space well space in space 15 space minutes
equals 800 plus 25 cross times 15 minus 30 cross times 15
equals 800 plus 375 minus 450
equals 1175 minus 450
equals 725 space litres end style
Answered by Rashmi Khot | 17 Jun, 2017, 11:09: PM
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