Ahmad, Lee, Pierre and Oscar participated in a Social Studies quiz. The average number of points scored by Ahmad and Lee was 76. The average number of points scored by Lee and Oscar was 71.4. The average number of points scored by Ahmad, Lee and Oscar was 71. The average number of points scored by Pierre and Oscar was 68. How many points did each of them score?

1. Oscar
2. Ahmad
3. Lee
4. Pierre

(a)
Total score of Ahmad and Lee
= 76 x 2
= 152

Total score of Lee and Oscar
= 71.4 x 2
= 142.8

Total score of Ahmad, Lee and Oscar
= 71 x 3
= 213

Oscar's score
= 213 - 152
= 61

(b)
Ahmad's score
= 213 - 142.8
= 70.2

(c)
Lee's score
= 142.8 - 61
= 81.8

(d)
Total score of Pierre and Oscar
= 68 x 2
= 136

Pierre's score
= 136 - 61
= 75

Answer(s): (a) 61; (b) 70.2; (c) 81.8; (d) 75