Tommy, Zeph, Andy and Seth participated in a Science quiz. The average number of points scored by Tommy and Zeph was 78. The average number of points scored by Zeph and Seth was 70.6. The average number of points scored by Tommy, Zeph and Seth was 70. The average number of points scored by Andy and Seth was 65. How many points did each of them score?

1. Seth
2. Tommy
3. Zeph
4. Andy

(a)
Total score of Tommy and Zeph
= 78 x 2
= 156

Total score of Zeph and Seth
= 70.6 x 2
= 141.2

Total score of Tommy, Zeph and Seth
= 70 x 3
= 210

Seth's score
= 210 - 156
= 54

(b)
Tommy's score
= 210 - 141.2
= 68.8

(c)
Zeph's score
= 141.2 - 54
= 87.2

(d)
Total score of Andy and Seth
= 65 x 2
= 130

Andy's score
= 130 - 54
= 76

Answer(s): (a) 54; (b) 68.8; (c) 87.2; (d) 76