#include <stdlib.h>
#include <stdio.h>
#include <math.h>

void Usage(void){
	printf("Usage:\n");
	printf("\t./viscosity [vis_a] [ounces_a] [vis_b] [ounces_b]\n");
	printf("\toutput: vis_c ounces_c\n");
}

int main(int argc, char **argv){
	double vis_a = 0;
	double vis_b = 0;
	double vis_c = 0;
	double ounces_a = 0;
	double ounces_b = 0;
	double ounces_c = 0;
	double tmp1, tmp2;

	if(argc != 5){
		Usage();
		exit(1);
	}
	vis_a = atof(argv[1]);
	ounces_a = atof(argv[2]);
	vis_b = atof(argv[3]);
	ounces_b = atof(argv[4]);

	tmp1 = vis_a*ounces_a + vis_b*ounces_b;
	tmp2 = ounces_a + ounces_b;
	tmp1 /= tmp2;

	vis_c = tmp1;
	ounces_c = tmp2;

	printf("%lf %lf\n", vis_c, ounces_c);


	return 0;
}