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Katyanochek1 [597]
3 years ago
8

Yesterdays low temperature was -2.5°C today low temperature is five times as lone as yesterday’s low temperature

Mathematics
1 answer:
zimovet [89]3 years ago
6 0

Answer:

-12.5°C

Step-by-step explanation:

To solve this problem you would multiply -2.5 by 5.

-2.5 * 5 = -12.5

Today's low temperature is -12.5°C.

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You need a 45% alcohol solution. On hand, you have a 175 mL of a 25% alcohol mixture. You also have 70% alcohol mixture. How muc
Bezzdna [24]

175 mL at 25% concentration of alcohol contains 0.25 (175 mL) = 43.75 mL of alcohol. If <em>v</em> is the amount of the 70% solution that you use, then that amount contains 0.7<em>v</em> mL of alcohol.

Mixing these two yields a total volume of 175 mL + <em>v</em>, and it contains 43.75 mL + 0.7<em>v</em> alcohol. You want to end up with a concentration of 45%, which means the ratio of the amount of alcohol to the total volume needs to be 0.45:

(43.75 mL + 0.7<em>v</em>) / (175 mL + <em>v</em>) = 0.45

Solve for <em>v</em> :

43.75 mL + 0.7<em>v</em> = 0.45 (175 mL + <em>v</em>)

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