Based on the fractions given, the number of pounds of grapes that are bought will be 4 29/40 pounds.
Since we're are given the information that Martin bought 12 3/5 pounds of grapes for a picnic while his friend bought 3/8 of that amount.
Therefore, the amount that his friend bought will be:
= 3/8 × 12 3/5
= 3/8 × 63/5
= 189/40
= 4 29/40
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