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irinina [24]
3 years ago
7

A chemistry teacher needs to mix a 30% salt solution with a 70% salt solution to make 20 qt of a 40% salt solution. How many qua

rts of each solution should the teacher mix to get the desired result?
Mathematics
1 answer:
fiasKO [112]3 years ago
7 0
The formula should be 0.3x + 0.7(20-x) = 0.4(20)
Simplifying it would get 3x + 7(20-x) = 4(20)
and: 3x + 140 - 7x = 80
then: 4x = 60
x = 15
So then for the 30% solution: 15 quarts
And for the 40%: 5 quarts
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Alex_Xolod [135]

2745

Step-by-step explanation:

solve it like simultaneously

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Not understanding how to solve
valentinak56 [21]

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Step-by-step explanation:Above


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3 years ago
Consider the natural numbers from 1 to 25. Write the prime numbers between 1 to 25. What fractions of these natural numbers are
Len [333]

Step-by-step explanation:

Natural numbers are numbers that include positive integers.

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25

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What Fractions of natural number are prime number?

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3 0
3 years ago
Travelling with a current, a boat covers a distance 1.5times greater than travelling against the current in the same amount of t
slega [8]
Let the speed of the current equal c
and the speed of the boat in still water equal b.

b + c = 1.5 (b - c)
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0.5b = 2.5c
b = 5c

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3 0
2 years ago
To determine what percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers. He then collected
Kipish [7]

Answer:

a)There are 14 teachers in Ryan's sample, and 362 teachers in the population.

Step-by-step explanation:

<u> Population:-</u>

<em>The totality of observations with which we are concerned, whether this number be finite or infinite  is called population.</em>

<em>Given data population is  376 teachers at a university were female'</em>

<u><em>Sample:-</em></u>

A sample is a subset of a Population

sample of given data = 14teachers

The percentage of 376 teachers at a university were female, Ryan randomly selected 14 teachers.

<em />p = \frac{14}{376} = 0.0372<em> = 3.72%</em>

6 0
3 years ago
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