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Zielflug [23.3K]
3 years ago
11

FIRST TO ANSWER GETS BRAINLIEST: The average age of one hundred Year 9 students is 14 y 10 m. The average age of one hundred Yea

r 8 students is 13 y 6 m. What is the average age, (in years and months), for the 200 combined Years 8 and 9 students? OPTIONS: .1) 14 Years 0 Months .2) 14 Years 2 Months .3) 13 Years 11 Months .4) 14 Years 8 Months .5) 13 Years 10 Months
Mathematics
1 answer:
Dvinal [7]3 years ago
4 0

Answer:

2) 14 y 2 m

Step-by-step explanation:

Year 9 students: total age= 100* 14 10/12= 1400 +100*5/6= 1483 y 8 m

Year 8 students: total age= 100* 13 6/12= 1350 y

Total age of 200 students: 1483 y 8 m + 1350 y= 2833 y 8 m

Average age= 2833  8/12  ÷ 200= (12*2833+8)/12 ÷ 200 = 34004/(12*200)= 34004/2400= 14  404/2400 ≈ 14 1/6 y= 14 y 2 m

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3 years ago
When Brad was born, his Grandma put, $1,500 in a new account for him. Since then, the balance of the account, has grown by 6.5%
marin [14]

Answer:

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Step-by-step explanation:

now at age of 18 Brad has 1500 * 1,065^18

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3 years ago
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Semenov [28]

Answer: -270

Step-by-step explanation:

First, simplify the exponent

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6 0
2 years ago
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If a concrete mix contains 1-1/2 cubic feet of gravel, 1/2 cubic foot of water,
Karolina [17]

Answer:

The correct answer is "50%".

Step-by-step explanation:

The given values are:

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By substituting the values, we get

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2 years ago
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Step-by-step explanation:

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3 years ago
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