Alex is decorating a large box with pieces of ribbon. He needs 7 sections of ribbon with a length of (3/4) yard. He is going to cut the 7 pieces from a roll of ribbon that is 30.2 yards long

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 For this case what you need to know is how much tape Alex needs.
 We have then:
 "He needs 7 sections of ribbon with a length of 3/4 yard"
 In other words:
 (7) * (3/4) = 5.25 yards.
 Therefore, the amount of tape that will be left over will be:
 30.2-5.25 = 24.95 yards.
 Answer:
 after Alex cuts the 7 pieces will remain 24.95 yards of ribbon
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