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EleoNora [17]
2 years ago
14

Suppose 8 out of every 20 students are absent from school less than 5 days a year. Predict how many students would be absent fro

m school less than 5 days a year out of 40,000 students. Explain your steps and show your work.
Mathematics
1 answer:
ch4aika [34]2 years ago
8 0

Answer: 16,000 students


Step-by-step explanation:

8/20 = x/40,000

20 * x = 8 * 40,000

x = (8 * 40,000)/20

x = 16,000 students

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30% of number A is 10 more than 20% of number B. 30% of number B is 35 more than 20% of number A. Find the numbers A and B.
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Answer:

A = 76.85

B =65.28

Step-by-step explanation:

(30/100)A = 10 + (20/100)B

0.3A - 0.2B = 10 ...... equation (i)

(30/100)B + 35 = (20/100)A

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From equation (i)

0.3A = 10 - 0.2B

A = (10 - 0.2b) / 0.3

A = 33.33 - 0.67B ........equation (iii)

Put equation (iii) into equation (ii)

0.2(33.33 - 0.67B) - 0.3B = 35

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B = 65. 275 = 65.28

Put B = 65.28 into equation (i)

0.3A - 0.2B = 10

0.3A - 0.2(65.28) = 10

0.3A - 13.056 = 10

0.3A = 10 + 13.056

A = 23.056/ 0.3

A = 76.85

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