Question

Students at Flemington College were surveyed to determine the type of tea they drink: black = 220. (B) or green (G). Students who don't drink tea did not participate in the survey. 4 The number of students who drink only black tea was three times more than the number of students who drink only green tea. 20 students indicated drinking both black and green tea. Let a be the number of students who drink only black tea. (a) Write down an expression, in term of a, for the number of students who drink only green tea. (b) Complete the Venn diagram below using the above information.

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Santino

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на вопрос а
20 студентов пьют и черный, и зеленый чай
a — количество студентов, пьющих только чёрный чай.
Число студентов, пьющих только черный чай, в три раза превышало количество студентов, пьющих только зеленый чай.
b — количество студентов, которые пьют только зеленый чай.
а=3b
b=\frac{a}{3}
количество студентов, которые пьют только зеленый чай, равно
\frac{a}{3}

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