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3 years ago

If 12x = 108 how much is x?

Mathematics

2 answers:

frozen [14]3 years ago

6 0

Answer:

x=9

Step-by-step explanation:

reverse the operation!

108÷12=9

It should work for most questions like this and is simple.

zepelin [54]3 years ago

5 0

Answer:

x=9

Step-by-step explanation:

Divide both sides by 12. The 12 on the left side cancels out. You are left with x=(108/12) which is the same as x=9.

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There are 5 exams in a semester. You have scored 77, 90, 85, and 100 on the previous four exams. What must you make on the fifth

siniylev [52]

Answer:

<h2>The correct answer for this question is 78.</h2>

Step-by-step explanation:

The average or mean of any variable or mathematical phenomenon is calculated as the division of the sum of all the numbers or items within the particular variable by the total number of items or numbers within the variable.
In this case, the marks of the 4 exams in the semester are 77,90,85 and 100 respectively.There are total 5 exams in the semester.
Let's suppose that the marks for the 5th exam is x.
Therefore, based on the mathematical formula to compute average or mean,to get an overall average of 86 including all the 5 exams, one has to get:-

$\frac{77+90+85+100+x}{5}=86$

$77+90+85+100+x=430$

$x=430-77-90-85-100$

$x=78$

Hence, based on the above calculations,one has has to get 78 on the 5th exam to obtain an overall average of exactly 86.

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sammy [17]

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3 years ago

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VikaD [51]

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3 years ago

Emma is building a wall around her garden. It has taken 45 minutes,and she is 75% done. What is the total time it will take Emma

Morgarella [4.7K]

Hey there,
It take 45 min to complete 75% of the wall
1% = 45 / 75
= 0.6
100 % = 0.6 x 100
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Hope this helps :))

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kari74 [83]

Answer:

Step-by-step explanation:

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