To calculate how much flaxseed Pietro needs for a 30-day supply, we first need to convert the amount he uses into an improper fraction.
Pietro uses \(2 \frac{1}{3}\) tablespoons of flaxseed. This can be converted to an improper fraction as follows:
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Multiply the whole number (2) by the denominator (3): \[ 2 \times 3 = 6 \]
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Add the numerator (1) to this result: \[ 6 + 1 = 7 \]
So, \(2 \frac{1}{3}\) tablespoons is equivalent to \(\frac{7}{3}\) tablespoons.
Next, we multiply this amount by 30 to find out how much flaxseed he needs for 30 days:
\[ \frac{7}{3} \times 30 = \frac{7 \times 30}{3} = \frac{210}{3} = 70 \]
Therefore, Pietro needs 70 tablespoons of flaxseed for a 30-day supply.