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https://vle.mathswatch.co.uk/images/questions/question15934.png

 Apr 21, 2020
 #1
avatar+902 
-4

7/10 drink tea, so 7/10 * 400 = 280 drink tea, 120 dont, 20% drink at least 3 cups a day, so 280*0.2 = 56, and the rest don't. 

 

56/400 = 28/200 = 14/100 = 7/50.

 

If you don't understnad anything feel free to ask.

 Apr 21, 2020
 #2
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+1

thnx 

for the at least three cups each day how do you find out the no.

Guest Apr 21, 2020
 #3
avatar+902 
-4

The question states that "20% of the people who drink tea drink at least 3 cups a day". 20% in decimal form is 0.2, or if you use fractions, 20/100 = 2/10 = 1/5. We then multiply this with the number of people drinking tea, 280, and get 280*0.2, or 280 * 1/5. We multiply because the 0.2 is a part of the whole, so when we multiply by that, it gives us the value. 

hugomimihu  Apr 21, 2020

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