Resposta:
import java.util.Scanner;
public class Main
{
public static void main(String[] args) {
Scanner valor = new Scanner(System.in);
double num = 0;
System.out.print("\n DIGITE UM VALOR: ");
num = valor.nextDouble();
mostrarDobro(num);
mostrarTriplo(num);
}
public static double mostrarDobro(double a){
double dobro = a * 2;
System.out.print("\n O drobro de " + a + " é: " + dobro);
return dobro;
}
public static double mostrarTriplo(double a){
double triplo = a * 3;
System.out.print("\n O triplo de " + a + " é: " + triplo);
return triplo;
}
}
