SOLUTION: a farmer harvested 21 tons of fruit this year. If this quantity is 70% of last year's crop, what was the decrease in tons of fruit harvested this year compared to last year?

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21 is 70% of last years crop(x)
:
21 =  .7  *                  x
:
21=.7x
:
divide both sides by .7
:
tons from last years crop