Answer:
3 (4+n)=n+18
Step-by-step explanation:
Let the unknown number be n.
Then 3(4 + n) = n + 18. This matches the third answer choice.
Answer:
C. [tex]3(4+n)=n+18[/tex]
[tex]n=3[/tex]
Step-by-step explanation:
Let n represent the number.
The sum of 4 and a number would be [tex]4+n[/tex].
Three multiplied by the sum of 4 and a number would be [tex]3(4+n)[/tex].
18 more than the number would be [tex]n+18[/tex].
To solve for the number, we will equate both expression as:
[tex]3(4+n)=n+18[/tex]
Therefore, our required equation would be [tex]3(4+n)=n+18[/tex].
Let us solve for n.
[tex]3*4+3*n=n+18[/tex]
[tex]12+3n=n+18[/tex]
[tex]12-12+3n=n+18-12[/tex]
[tex]3n=n+6[/tex]
[tex]3n-n=n-n+6[/tex]
[tex]2n=6[/tex]
[tex]\frac{2n}{2}=\frac{6}{2}[/tex]
[tex]n=3[/tex]
Therefore, the number is 3.
