2 years ago

What is the measure of a?

Mathematics

1 answer:

Eddi Din [679]2 years ago

3 0

Answer:

I think 60

Step-by-step explanation:

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its was taylor's 8th birthday and there were 47 presents. Each kid brought 10 presents, except for three kids who brought five p

goblinko [34]

47 - 5*3 - 2*1 = 30. 30/3 = 3, so add three plus five plus two = 10 kids

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3 years ago

You must use the Substitution method

elena-14-01-66 [18.8K]

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3 years ago

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Carys calculates the total amount E, in dollars, that she earns for working h hh hours using the equation E=10h. How many dollar

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Cna i get some help with dis plz

Tomtit [17]

Let $b_1,b_2,\ldots,b_{20}$ be the 20 marks of the boys, and $g_1,g_2,\ldots,g_{10}$ be the 10 marks of the girls.

We know that the global mean was 70, meaning that

$\dfrac{b_1+b_2+\ldots+b_{20}+g_1+g_2+\ldots+g_{10}}{30}=70$

Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is

$b_1+b_2+\ldots+b_{20}+g_1+g_2+\ldots+g_{10}=2100$

By the same logic, we work with the marks of the boys alone: we know the average:

$\dfrac{b_1+b_2+\ldots+b_{20}}{20}=62$

And we deduce the sum of the marks for the boys:

$b_1+b_2+\ldots+b_{20}=1240$

Which implies that the sum of the marks of the girls is $2100-1240=860$

And finally, the mean for the girls alone is

$\dfrac{860}{10}=86$

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3 years ago

What is the measure of a?​

What is the measure of a?