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how to solve a ratio word problem

Sagot :

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Example:
PROBLEM:
                 Five notebooks cost $80.How many notebooks can buy with $112?
SOLVE:       
                 notebooks=notebooks
                   money         money
      
                     5 = n
                    80=112
       Solution:
               80n=112 × 5       Find the productof the means and the extremes.
                80n=560            
                  80   80            Divide both sides of the equation by 80
                    
               n=7  ANSWER:  7 notebooks can buy with $112