4/5 divided by 1/10?

Mathematics

2 answers:

Evgesh-ka [11]2 years ago

6 0

Answer:

the answer to the question is 8

mylen [45]2 years ago

4 0

8
Dividing by a fraction is the same as multiplying by its reciprocal
(4/5)/(1/10) is the same as (4/5)*(10/1)
So (4*10/5*1) =40/5=8

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In 1975 1000 tons of coal was manufactured. It is 10% greater in 1976 and 5% less in 77. What is the final about of coal in 1977

Digiron [165]

In 1975 it was 1000tons, ok, well, in 1976 it went up by 10%, how much is a 10% increase?

$\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1000&100\\
x&100+10
\end{array}\implies \cfrac{1000}{x}=\cfrac{100}{100+10}\implies \cfrac{1000\cdot 110}{100}=x
\\\\\\
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well, in 1976 it was 1100 tons then, and in 1977 it went down by 5% of 1100, well, if we take 1100 to be the 100%, then what is a 5% decrease?

$\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1100&100\\
x&100-5
\end{array}\implies \cfrac{1100}{x}=\cfrac{100}{100-5}\implies \cfrac{1100\cdot 95}{100}=x$

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3 years ago

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Vika [28.1K]

Answer:

A.4

Step-by-step explanation:

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2 years ago

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