The number of oranges Heidi needs for her orange juice is 9 oranges
Number of 2 fl oz of orange needed = Large cup of orange juice ÷ 2 fl oz to cup
= 2 1/4 ÷ 1/4
= 9/4 ÷ 1/4
= 9/4 × 4/1
= 9 oranges
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