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Ghella [55]
3 years ago
6

The average age of a college is 21.8 years. The average age of students of college is 24.2 years and average age of lecturers of

college is 20.6 years. Find the ratio of the number of students to that of lecturers?​
Mathematics
1 answer:
boyakko [2]3 years ago
7 0

Answer:

22,2

Step-by-step explanation:

average also known as mean

so you find it by adding all the numbers together and dividing them by how many there are

so 21,8 + 24,2 + 20.6 = 66,6 divided by 3 equals 22,2

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Which one of the following numbers is an irrational number? A. 5.364 B. 123⁄455 C. 3.131131113… D. 8.234234…
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Can u please help me? I need help with both of them. Thanks
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Answer:

first answer is (A)

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Step-by-step explanation:

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3 0
3 years ago
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Ms. miller decides to give a test worth 90 points and contains 25 questions. multiple-choice questions are worth 3 points and wo
schepotkina [342]
X= # of multiple choice questions
y= # of word problem questions

EQUATION 1:
x + y= 25

EQUATION 2:
3x + 4y= 90


STEP 1:
solve for one variable in equation 1

x + y= 25
subtract y from both sides
x= 25 - y


STEP 2:
substitute x=25-y in equation 2

3x + 4y= 90
3(25-y) + 4y= 90
75 - 3y + 4y= 90
75 + y= 90
subtract 75 from both sides
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STEP 3:
substitute y value to find x

x + y= 25
x + 15= 25
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ANSWER: There are 15 word problems and 10 multiple choice questions.

Hope this helps! :)
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3 years ago
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