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1 dozen = 121/45th of a dozen = 12/45 = 4/15 = 0.2666 (rounded, repeating)
25 percent of five dozen (60) is 15. 5 dozen = 5*12 = 60
15*6= 90
(15 x 60) / 0.6 = 1,500 groceries, IF she can keep going at that rate for 15 minutes.
Your 7.5 represents 62.5% of a dozen. Let's see why.A dozen is 12, and 7.5/12 is 15/24. (That "gets rid of" the decimal; we doubled the numerator and denominator.) A percent is a one hundredth of something, so 15/24 is "x"/100. If 15/24 = x/100, then we have 62.5/100ths after we do the math. As percent is "one hundredths," 62.5/100 is 62.5%.