2 years ago

Please HELP ME!!!!! Asap

Mathematics

1 answer:

Arlecino [84]2 years ago

4 0

Answer:

I’m pretty sure its 27

Step-by-step explanation:

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If a 12-student class averaged 90 on a test, and a 20-student class averaged 80 on the test, then all 32 students averaged

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Let the marks of the students in class 1 be

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the average of these 12 marks is 90, so

$\frac{m_1+ m_2+ .....+ m_1_2}{12}=90$

which means

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similarly, let $n_1, n_2, ....., n_2_0$ be the marks of the students in the second class,

so $\frac{n_1+ n_2+ ..... n_2_0}{20}=80$

which means $n_1+ n_2+ ..... n_2_0=80*20=1600$

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$\frac{(m_1+ m_2+ .....+ m_1_2)+(n_1+ n_2+ ..... n_2_0)}{12+20}= \frac{1080+1600}{32}= \frac{2680}{32}= 83.75$

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Can you guys please help me

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The answer is B. First turn all the results from the spelling competition into fractions (or ratios).
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Justin: 27/30 = 9/10
Fernando: 84/120 = 7/10
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Have a nice day! :)

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3 years ago

HURRY PLEASE!!!

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