Cole, Lee, Sean and Oscar participated in a History quiz. The average number of points scored by Cole and Lee was 75. The average number of points scored by Lee and Oscar was 70.6. The average number of points scored by Cole, Lee and Oscar was 72. The average number of points scored by Sean and Oscar was 69. How many points did each of them score?

1. Oscar
2. Cole
3. Lee
4. Sean

(a)
Total score of Cole and Lee
= 75 x 2
= 150

Total score of Lee and Oscar
= 70.6 x 2
= 141.2

Total score of Cole, Lee and Oscar
= 72 x 3
= 216

Oscar's score
= 216 - 150
= 66

(b)
Cole's score
= 216 - 141.2
= 74.8

(c)
Lee's score
= 141.2 - 66
= 75.2

(d)
Total score of Sean and Oscar
= 69 x 2
= 138

Sean's score
= 138 - 66
= 72

Answer(s): (a) 66; (b) 74.8; (c) 75.2; (d) 72