Andy, Oliver, Luis and Daniel participated in a Science quiz. The average number of points scored by Andy and Oliver was 77. The average number of points scored by Oliver and Daniel was 70.5. The average number of points scored by Andy, Oliver and Daniel was 72. The average number of points scored by Luis and Daniel was 69. How many points did each of them score?

1. Daniel
2. Andy
3. Oliver
4. Luis

(a)
Total score of Andy and Oliver
= 77 x 2
= 154

Total score of Oliver and Daniel
= 70.5 x 2
= 141

Total score of Andy, Oliver and Daniel
= 72 x 3
= 216

Daniel's score
= 216 - 154
= 62

(b)
Andy's score
= 216 - 141
= 75

(c)
Oliver's score
= 141 - 62
= 79

(d)
Total score of Luis and Daniel
= 69 x 2
= 138

Luis's score
= 138 - 62
= 76

Answer(s): (a) 62; (b) 75; (c) 79; (d) 76