jayleengrant
05.07.2019 •
Mathematics
Astudent scored 72 out of 100 on a test. if the maximum score on the next test is also 100 what score would he need to keep an average of 81
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Ответ:
multiply 2(81)
72 + x = 162
subtract 72 from both sides
x = 90
He would need to score 90% on his next test.
Ответ:
9514 1404 393
x = 2
Step-by-step explanation:
As you have indicated, you want to multiply both sides of the equation by 6x.
_____
Additional comment
The denominator on the left is x. The least common denominator on the right is 6. To clear fractions, you can multiply by the product of these values: 6x. Doing this gave us the one-step linear equation 6 = 3x.
As with any operation performed on an equation, the operation must be performed on both sides of the equation. Here, we multiply both sides by 6x. It is a bit unconventional and confusing to show that multiplication as you have shown it in your figure. Usually, it would be shown as in the 2nd line of the solution, above.