Answer:
The correct option is A.
Step-by-step explanation:
Let the unknown number be x.
It is given that 5 times the sum of 12 and a number is 80.
[tex]5(12+x)=80[/tex]
Using distributive property we get
[tex]5(12)+5x=80[/tex]
[tex]60+5x=80[/tex]
Subtract 60 from both the sides.
[tex]5x=80-60[/tex]
[tex]5x=20[/tex]
Divide both sides by 5.
[tex]x=4[/tex]
The value of x is 4. Therefore the correct option is A.
