JAMB Physics 1979 Question 39

Fig. 10 shows a see-saw which is exactly in balance. The weights of the people sitting on it are 50 kg, X kg and 15 kg as shown. They sit at distances of 1½ m, 1½ m and 2 m from the pivot respectively. The value of X is

1. A.30
2. B.35
3. C.70
4. D.26¼
5. E.impossible to find.