Answer:
Sarah = 202.2 points
Robert = 8.4 points
James = 67.4 points
Explanation:
James = x point
Sarah = 3x point
Robert = x - 59 point
Total = £11.88
Each point = 3 pence
All students have a total of £11.88
1 pound = 100 pence
£11.88 pound = 1,111 pence
(x * 3) + (3x * 3) + (x - 59)3 = 1,188
3x + 9x + 3x - 177 = 1,188
15x = 1,188 - 177
15x = 1,011
x = 1,011 / 15
x = 67.4 points
James = x point
= 67.4 points
James = 67.4 points
Sarah = 3x point
= 3(67.4)
= 202.2 points
Sarah = 202.2 points
Robert = x - 59 point
= 67.4 - 59
= 8.4 points
Robert = 8.4 points