프로그래밍_일반/백준
boj 10984
Spadework
2020. 2. 4. 10:17
* Solved 기준 브론즈3 단순 풀이
for _ in range(int(input())):
s,g = 0, 0
for _ in range(int(input())):
a,b = map(float, input().split())
s+=a;g+=a*b
print(int(s),round(g/s,1))