Final answer:
To multiply mixed numbers, convert them to improper fractions, multiply the fractions, and simplify the result.
Step-by-step explanation:
To multiply mixed numbers, we first convert them to improper fractions. 2 1/2 can be written as 5/2 and 31/1/20 can be written as 31/20. Multiply the numerators and the denominators: 5/2 * 31/20 = (5 * 31)/(2 * 20) = 155/40.
To simplify the fraction, we can divide both the numerator and denominator by their greatest common divisor. The GCD of 155 and 40 is 5. Dividing both by 5, we get 31/8.
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