Ivan, Mark, Neave and Billy participated in a Science quiz. The average number of points scored by Ivan and Mark was 75. The average number of points scored by Mark and Billy was 70.6. The average number of points scored by Ivan, Mark and Billy was 73. The average number of points scored by Neave and Billy was 69. How many points did each of them score?

1. Billy
2. Ivan
3. Mark
4. Neave

(a)
Total score of Ivan and Mark
= 75 x 2
= 150

Total score of Mark and Billy
= 70.6 x 2
= 141.2

Total score of Ivan, Mark and Billy
= 73 x 3
= 219

Billy's score
= 219 - 150
= 69

(b)
Ivan's score
= 219 - 141.2
= 77.8

(c)
Mark's score
= 141.2 - 69
= 72.2

(d)
Total score of Neave and Billy
= 69 x 2
= 138

Neave's score
= 138 - 69
= 69

Answer(s): (a) 69; (b) 77.8; (c) 72.2; (d) 69