Fred, Riordan, Dylan and Ian participated in a History quiz. The average number of points scored by Fred and Riordan was 74. The average number of points scored by Riordan and Ian was 70.1. The average number of points scored by Fred, Riordan and Ian was 72. The average number of points scored by Dylan and Ian was 68. How many points did each of them score?

1. Ian
2. Fred
3. Riordan
4. Dylan

(a)
Total score of Fred and Riordan
= 74 x 2
= 148

Total score of Riordan and Ian
= 70.1 x 2
= 140.2

Total score of Fred, Riordan and Ian
= 72 x 3
= 216

Ian's score
= 216 - 148
= 68

(b)
Fred's score
= 216 - 140.2
= 75.8

(c)
Riordan's score
= 140.2 - 68
= 72.2

(d)
Total score of Dylan and Ian
= 68 x 2
= 136

Dylan's score
= 136 - 68
= 68

Answer(s): (a) 68; (b) 75.8; (c) 72.2; (d) 68