Justin, Jenson, Oscar and Harry participated in a Social Studies quiz. The average number of points scored by Justin and Jenson was 74. The average number of points scored by Jenson and Harry was 71.6. The average number of points scored by Justin, Jenson and Harry was 72. The average number of points scored by Oscar and Harry was 67. How many points did each of them score?

1. Harry
2. Justin
3. Jenson
4. Oscar

(a)
Total score of Justin and Jenson
= 74 x 2
= 148

Total score of Jenson and Harry
= 71.6 x 2
= 143.2

Total score of Justin, Jenson and Harry
= 72 x 3
= 216

Harry's score
= 216 - 148
= 68

(b)
Justin's score
= 216 - 143.2
= 72.8

(c)
Jenson's score
= 143.2 - 68
= 75.2

(d)
Total score of Oscar and Harry
= 67 x 2
= 134

Oscar's score
= 134 - 68
= 66

Answer(s): (a) 68; (b) 72.8; (c) 75.2; (d) 66