Twenty-Five Decreased By One Fifth Of A Number Is 18

Twenty-five decreased by one fifth of a number is 18

 

The Answer is :

25 - \frac{1}{5} x = 18 \\ minus \: 25 \: both \: sides \\ - \frac{x}{5} = - 7 \\ \times \: ( - 5) \: both \: sides \\ x = 35 \\ checking \\ 25 - 7 = 18 \\ 18 = 18


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