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4 years ago

1/2 (4-k)=2/5 Distribute and find LCM

Mathematics

1 answer:

borishaifa [10]4 years ago

3 0

Answer:

20 -5k = 4
the LCM of the denominators is 10

Step-by-step explanation:

I find it convenient to do the problem in the reverse order: find the LCM, then distribute. That way, I'm not distributing a fraction.

The LCM of 2 and 5 is their product: 2·5 = 10. Multiplying the equation by 10 gives ...

5(4 -k) = 4

Now, distributing, we get ...

20 -5k = 4

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3 years ago

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4 years ago

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4x+3y=16 x= -3 and y= -2 Solve the equation

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Answer:

Is this question wrong?

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3 years ago

Identify the like terms in the following expression: 15m + 2n - 4m + n +12m

Romashka [77]

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4 years ago

Last time, one out of every 4 students in our class was absent. This time, after Jen came back, only one out of every 5 students

VMariaS [17]

Answer: There are 20 students and 4 students are not here today.

Step-by-step explanation:

If the number of students = 4

Let the number of students be 'x'.

Fraction of students absent = $\dfrac{x}{4}$

If the number of students = 5

Fraction of students absent = $\dfrac{x}{5}$

And Jen came back,

So, the fraction of student absent is also written as

$\dfrac{x}{4}-1$

According to question, it becomes,

$\dfrac{x}{5}=\dfrac{x}{4}-1\\\\\dfrac{x}{5}=\dfrac{x-4}{4}\\\\4x=5(x-4)\\\\4x=5x-20\\\\4x-5x=-20\\\\-x=-20\\\\x=20$

Hence, there are 20 students in our school.

And number of students are not here today is $\dfrac{20}{5}=4$

3 0

3 years ago