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If you make the grapefruits the variable x, you can create the equation 1.5x = 30 oz. Solve for x (the weight of one grapefruit) by dividing both sides of the equation by 1.5. 30/1.5 = 20. If x = 20, then 4 x's (grapefruits) would be 4 * 20, which is 80.

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12y ago
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11y ago

1.5 grapefruits = 30 oz

So each one is 30/1.5 = 20 oz

and so 4 are 20*4 = 80 oz.

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Q: What is the weight of 4 grapefruit if one and a half weigh 30 oz?
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