Lee needs 15 pieces of string, each one half of a inch long she cut a 6 inch piece of drink into pieces that are each one half of an inch long, how many more pieces of string does she need?

3

Step-by-step explanation:

A 6-inch piece of string can be cut into 12 pieces that are 1/2 inch each. If Lee needs 15 pieces, she needs 3 more.

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Each inch is divided into 2 pieces. That's what 1/2 inch means. 6*2 = 12.