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gavmur [86]
2 years ago
13

in a classroom the number of girls is 3 and 2/3 times the number of boys. there are 16 more girls than boys. find the total numb

er of students in the classroom. Explain your answer.
Mathematics
1 answer:
nalin [4]2 years ago
5 0
I think it is 19 boys in the classroom
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iVinArrow [24]

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b

Step-by-step explanation:

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Nataliya [291]

Answer:

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Step-by-step explanation:

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4 0
2 years ago
A metallurgist has an alloy with 5% titanium and an alloy with 30% titanium. He needs 100 grams of an alloy with 15% titanium. H
andrey2020 [161]
Let us convert the percentages to decimal format first.. so 5% is just 5/100 or 0.05 and 15% is just 15/100 or 0.15

so hmmm, so, let's say it needs "x" amount and "y" amount of each respectively, so, whatever "x" and "y" are, they must add up to 100, and whatever their concentration is, must add up to what the mixture yields

thus

\bf \begin{array}{lccclll}
&amount&concentration&
\begin{array}{llll}
concentrated\\
amount
\end{array}\\
&-----&-------&-------\\
\textit{5\% alloy}&x&0.05&0.05x\\
\textit{30\% alloy}&y&0.30&0.3y\\
-----&-----&-------&-------\\
mixture&100&0.15&15
\end{array}
\\\\\\
\begin{cases}
x+y=100\implies \boxed{y}=100-x\\
0.05x+0.3y=15\\
----------\\
0.5x+0.3\left( \boxed{100-x} \right)=15
\end{cases}

solve for "x"

what's "y"? well, y = 100 - x
4 0
3 years ago
HELP ASAP!!!.
Arte-miy333 [17]

Answer:

$54

Step-by-step explanation:

Since its $0.24 per 1 square inch, you would multiply 0.24 by the total amount of square inches. When we do this, we get 54 as our answer.\

 Hope this helps!

3 0
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She regrouped the numbers instead of multiplying like 8b(2b-r) -4r(2b-r).

8 0
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