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the salt concentration is (C), (t)is minutes is given by 

 

c(t)= 10t/25+t

 

where c is measured as grams per liters. when does the salt concentration reach 3.75g/l ?

 Nov 16, 2020
 #1
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I'll assume  that this is   10t / { 25 + t ]

 

So

 

3.75  = 10t  / [ 25 + t]        multiply both sides by  25 + t

 

3.75 [ 25 + t]  = 10t      simplify

 

93.75  + 3.75 t =10 t      subtract 3.75 t from both sides

 

93.75  = 6.25 t     divide both sides by 6.25

 

t  =15  (min)

 

 

cool cool cool

 Nov 16, 2020

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