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4725 cubic inches. you multiply 15 x 21 x 15. since you are going to label this cubic inches, you need to find the volume of this box or how much space it ouccupies. The formula for finding the volume of a box is length x width x height. so you just multiply these two numbers

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12y ago
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Q: How many cubic inches are in a box 21w 15h 15l?
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