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Bogdan [553]
3 years ago
14

Three boxes have a total weight of 640 pounds. Box A weights twice as much as Box B. Box C weight 30 pounds more than Box A. How

much do each of the boxes weigh?
Mathematics
1 answer:
Zarrin [17]3 years ago
4 0

Answer:

  A: 244 pounds

  B: 122 pounds

  C: 274 pounds

Step-by-step explanation:

We have A+B+C = 640; A=2B; C=A+30. Substituting the last into the first gives ...

  A + B + (A +30) = 640

  2A +B = 610 . . . . . . . . . . . . subtract 30

Substituting the second into this equation gives ...

  2(2B) +B = 610

  B = 610/5 = 122 . . . . . divide by 5

  A = 2B = 244 . . . . . . . .find A from B

  C = A+30 = 274 . . . . . find C from A

Box A weighs 244 pounds; box B weighs 122 pounds; box C weighs 274 pounds.

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Answer:

Step-by-step explanation:

We want to determine a 90% confidence interval for the true population mean textbook weight.

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We will apply the formula

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It becomes

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Therefore, with 90% confidence interval, the true population mean textbook weight is between 62.21 ounces and 65.79 ounces

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How much will $5000 be worth in 5 years if it is compounded continuously at 3% interest?
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Step-by-step explanation:

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