That is two plus four = 84 * 2 =168; Four-two = 10 is transformed into a sum-difference problem.
So four =( 168+ 10)/2=89.
Two =( 168- 10)/2=79.
Average score 14 =86
So, one =86*2-89=83.
The average score is 9 1.5,
So, three =9 1.5*2-83= 100.
So, five =89*5-83-79- 100-89=94.