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Natali [406]
3 years ago
10

A scientist mixes water (containing no salt) with a solution that contains 35 % salt. She wants to obtain 245 ounces of a mixtur

e that is 5 % salt. How many ounces of water and how many ounces of the 35 % salt solution should she use?
Mathematics
1 answer:
Elenna [48]3 years ago
5 0

Answer:

Answer.  105 ounces of water is needed.

Let W = the volume of water to be mixed in ounces).

Then the volume of the 30% salt solution needed is (210-W).

The balance equation for the salt mass is

0.3*(210-W) = 0.15*210.

Simplify and solve for W:

63 - 0.3W = 31.5,

63 - 31.5 = 0.3W,

0.3W = 31.5,

W = 31.5%2F0.3 = 105.

Answer.  105 ounces of water is needed.

Step-by-step explanation:

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Step-by-step explanation:

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Zack, Jack and Sasha earned £250 altogether delivering leaflets.
AleksAgata [21]

Answer:

Zack earned £125, Jack earned £75, and Sasha earned £50

Step-by-step explanation:

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Zack 50%, Jack 30% and Sasha 20%

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If they earn £250 on the 100% delivery, then each will have as shown below

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Step-by-step explanation:

y=-2x+6.

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2 years ago
What’s x to 5x+2 is greater than 3x+10
katovenus [111]
<h2>The value of x is  always grater than 4.</h2><h3>Therefore x = (4,∞)</h3>

Step-by-step explanation:

Given

5x+ 2 >3x+10

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<h3>The value of x is  always grater than 4.</h3><h3>Therefore x = (4,∞)</h3>
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3 years ago
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If 72 is 120% of a number, what is 80%<br> of this number?
cupoosta [38]

Answer:

60

Step-by-step explanation:

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 172 = 120% × Y

STEP 272 =  

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Multiplying both sides by 100 and dividing both sides of the equation by 120 we will arrive at:

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You can easily calculate 72 is 120 percent of what number by using any regular calculator, simply enter 72 × 100 ÷ 120 and you will get your answer which is 60

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2 years ago
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