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Zarrin [17]
3 years ago
9

"Sam" and "Martha" are the local names for two lighthouses that guard a particularly dangerous part of the coast. Sam blinks eve

ry 12 seconds, and Martha blinks every 8 seconds. They blink together at midnight. How many seconds will pass before they blink together again?
Mathematics
2 answers:
Korvikt [17]3 years ago
7 0

Answer:

at 12 o'clock am they will blink at the same time again

Step-by-step explanation:

Hunter-Best [27]3 years ago
4 0

Answer:

Sam and Martha will blink again in 24 seconds :)

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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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Join our among us <br><br> Code: KFTJFF
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bulgar [2K]

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Step-by-step explanation:

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