Find 250% of 800How did you work the problem out?!!

2 answers:

4 0

Find 100% which is 800

100% (800) X2= 1600

Find 50% of 800 which is 400

1600+400=2000

OR

250%=2.5 in decimals

800X2.5=2000

zaharov [31]3 years ago

3 0

250% is 2.5 multiply 800 by 2.5 and you should get 2000

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Answer:

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Read 2 more answers

What is this simplified? Please help

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Answer:

The end result is -1/(x + 1)

Step-by-step explanation:

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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

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3 years ago