2 years ago

Following classes has a ratio of girls to total students of 7: 10

1 answer:

3 0

<span>the answer is A, because there are 10 total students (7+3) and there are 7 girls in the class making it a 7:10 ratio.</span>

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padilas [110]

Answer: B

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2 years ago

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

Alexxx [7]

Let the marks of the students in class 1 be

$m_1, m_2, ....., m_1_2$

the average of these 12 marks is 90, so

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

which means

$m_1+ m_2+ .....+ m_1_2=90*12=1080$

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

The 32 students averaged:

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

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Ilya [14]

1 & 4 & 6 are the answers

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3 years ago

The functions below show the amount of money Bella and Sweet T had saved after earning money for doing chores.

NeTakaya

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Bella saves more per chore than sweet t

Step-by-step explanation:

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