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wolverine [178]
2 years ago
9

in a sale the cost of a coat reduced from $85 to $67.50 calculate the percentage reduction in the cost of the coat

Mathematics
1 answer:
ludmilkaskok [199]2 years ago
8 0
20.58% would be the answer
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A collection of 108 coins containing only quarters and nickels is worth $21.
Rudiy27

Answer:

The value could replace q is 108 - n ⇒ the last answer

Step-by-step explanation:

* Lets study the values of quarters and nickles

- One quarter = 25 cents

- One nickle = 5 cents

- The number of coins is 108

- The coins are nickles or quarters only

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* Lets solve the problem

∵ The number of coins is 108 coins

- Let the quarter is q and the nickel is n

∴ q + n = 108 ⇒ (1)

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∵ $ 1 = 100 cents

∴ $21 = 21 × 100 = 2100 cents

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∵ The nickels = 5 cents

∴ 25q + 5n = 2100 ⇒ (2)

- To find the value which replace q use equation (1)

∵ q + n = 108 ⇒ subtract n from both sides

∴ q = 108 - n

* The value could replace q is 108 - n

3 0
3 years ago
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Brian works 40 hours a week. He spends 40% of his time helping customers, 13% doing paperwork, and the remainder performing othe
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