3 years ago

9 is 60% of what number ?

Mathematics

1 answer:

MrMuchimi3 years ago

7 0

9 is 60% of 15 because 60x15 over 100 equals 9

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mary needs to save $540 for a computer. It was used and the sales man told her he would sell it for 1\3 off the marked price. wh

den301095 [7]

Answer:

$360

Step-by-step explanation:

Initial price = $540

Less ⅓ off = <u>- 180 </u>

Sale price = $360

Note: ⅓ × $540 = $180

The price of the computer is $360 after the markdown.

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3 years ago

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3 years ago

Hotel Management: The Airgle AG800 can purify the air in a conference hall in 20 fewer minutes than it takes the Airgle AG950 to

marta [7]

Let x be the time for the AG800. Then the time for the AG950 is x + 20.
$\frac{1}{x}+\frac{1}{x+20}=\frac{2}{21}$
$\frac{x+20+x}{x(x+20)}=\frac{2}{21}$
Cross-multiplying and simplifying, we get:
$2x^{2}-2x-420=0$
The positive solution to this quadratic is: x = 15.
The answer is: Time for model AG800 = 15 minutes: time for model AG950 = 35 minutes.

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3 years ago

AthXL for School:

Arlecino [84]

Answer:

$28.5

Step-by-step explanation:

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