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Q&A #5617

Teachers' Lounge Discussion: Percentages

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From: Loyd

To: Teacher2Teacher Public Discussion
Date: 2002101020:37:00
Subject: Re: Use of Percentage Sign in equation

On 2002101012:34:04, William wrote: > >I was asked by a mother whether a percentage cane be represented in an >equation like the following. > > >The example here asks: > >"A shop keept sells 20% of his orange stock today @ $0.5 each and he >earns $50 today. So how many orange he has in stock when he start >business?" > >I was asked whether this is an appropriate formau: > >Say y is the original number of oranges > >20%y * 0.5 = 50. > >I was doubt that notation like "20 % y" means something else in >mathematic world...where the "%" is an operators of special use. > >Please help. > % means divide by 100, so 20% = .20 (that is 20/100). Also, Per means divide so, "percent" means divide by a hundred. Let y= original number of oranges. (.2y)*.5 = 50 .1y = 50 y= 500 oranges. Your equation gives the same thing. 20%y * 0.5 = 50 10%y = 50 y = 500 (10% of 500 = 50 The usual procedure is to change the percent to a decimal.

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