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To find out how many pints of strawberries Ricardo used for the jam, we need to multiply the number of pints of strawberries he picked (3 1/2) by the fraction of strawberries used to make jam (4/5).
To multiply the whole number and the fraction, we first need to convert the whole number to an improper fraction:
3 1/2 = (2 * 3 + 1) / 2 = 7/2
So, the calculation becomes:
(7/2) * (4/5) = (7 * 4) / (2 * 5) = 28/10
To simplify this fraction, we divide both the numerator and denominator by the greatest common divisor, which is 2:
28/10 = (28/2) / (10/2) = 14/5
Therefore, Ricardo used 14/5 pints of strawberries for the jam, which can be simplified as the mixed number in simplest form: 2 4/5 pints.