Toilets

A federal law requires that all residential toilets sold in the United States use no more than 1 3/5 gallons of water per flush. Prior to this legislation, conventional toilets used 3 2/5 gallons of water per flush. Find the amount of water saved in one year by a family flushing the toilet 22 times each day if one conventional toilet is replaced with a new low flow one. (1 year = 365 days)

Result

y =  14454 gal

Solution:

n=22 365=8030 V=(3+25)(1+35)=95=1.8 gal  y=n V=8030 1.8=14454=14454  gal n = 22 \cdot \ 365 = 8030 \ \\ V = (3 + \dfrac{ 2 }{ 5 } ) - (1 + \dfrac{ 3 }{ 5 } ) = \dfrac{ 9 }{ 5 } = 1.8 \ gal \ \\ \ \\ y = n \cdot \ V = 8030 \cdot \ 1.8 = 14454 = 14454 \ \text{ gal }



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