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2 years ago

6 is subtracted from a number. The result is divided by 4. This result is added to 10 to give 30. What is the number?

1 answer:

6 0

Answer: 86

Explanation: I started with 30 then reversed everything so I subtracted 10, multiplied by 4, and then added 6, and got the number 86. Then I checked the answer by subtracting 6 from 86, then divided it by 4, added it to 10, and the final number equaled 30.

I hope this is the answer you were looking for! I’m so sorry if it’s wrong!

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2 years ago

How many L of A 90% saline solution must be mixed with 4 L of a 50% saline solution to make a 74% solution ?

insens350 [35]

Answer:

6 L

Step-by-step explanation:

Given two solutions:

1st solution is 90% saline solution. Let the volume of this solution be $x$ litres.

2nd solution is 50% saline solution. Volume of this solution = 4 L

Resultant solution is 74% saline.

To find:

The volume of 1st solution = ?

Solution:

Total volume of the 74% saline mixture = (4+ $x$ ) Litres

We can write equation here, as per the percentage of saline in the mixtures.

90% of $x$ L + 50% of 4 L = 74% of ( $x$ +4)

$\Rightarrow \dfrac{90x}{100} + \dfrac{50}{100}\times 4 = \dfrac{74}{100}\times (x+4)\\\Rightarrow 90x + 200 = 74x+296\\\Rightarrow 90x-74x = 296-200\\\Rightarrow 16x = 96\\\Rightarrow x = \bold{6\ L}$

Therefore, the volume must be <em>6 L</em>.

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2 years ago