Respuesta :
Let n be unknown number, then 1/5 of this number is 1/5n. When you add these two numbers, you get
[tex] n+\dfrac{1}{5} n.[/tex]
You know that this sum is equal to 24, so
[tex] n+\dfrac{1}{5} n=24.[/tex]
1. Multiply this equation by 5:
[tex] 5n+n=120.[/tex]
2. Solve it:
[tex] 6n=120,\\n=120:6,\\n=20.[/tex]
Answer: n=20, correct choice is B.