All the sampling methods used in the given survey are; convenience, systematic, and voluntary sampling.
<h3>What is the sampling method used?</h3>
From the question, we see that the surveyor selects the twentieth student who enters the building.
Now, the student do not enter the building to be surveyed but instead for other reasons and as such the researcher takes advantage of that and selects them. This is a form of convenience sampling.
It is also a form of systematic sampling because the researcher selects every twentieth student and not any other.
Lastly, it is a form of Voluntary sampling because the students selected to participate in the survey are free to choose whether to participate in the survey or not.
Read more about Sampling Methods at; brainly.com/question/9910540
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<em>x</em> = liters of 40% solution, which contributes a total of 0.4<em>x</em> liters of acid
<em>y</em> = liters of 30% solution, which contributes a total of 0.3<em>y</em> liters of acid
The chemist wants to end up with 50 liters, so
<em>x</em> + <em>y</em> = 50
and 36% of this -- 0.36 (50 liters) = 18 liters -- is acid, so that
0.4<em>x</em> + 0.3<em>y</em> = 18
Solve for <em>x</em> and <em>y</em> :
<em>y</em> = 50 - <em>x</em>
0.4<em>x</em> + 0.3 (50 - <em>x</em>) = 18
0.4<em>x</em> + 15 - 0.3<em>x</em> = 18
0.1<em>x</em> = 3
<em>x</em> = 30
<em>y</em> = 20
Ayurveda, traditional Indian medicine (TIM):
Traditional Chinese medicine (TCM) remains the most ancient yet living tradition. There has been increased global interest in traditional medicine.
Me still not understanding