Question 797819
{{{S}}}= sum of 4 best scores
{{{S+65}}}= sum of the scores for all five tests
The average the 5 tests is calculated as {{{(S+65)/5}}} and it was 85, so
{{{(S+65)/5=85}}}
{{{S+65=5*85}}}
{{{S+65=425}}}
{{{S=425-65}}}
{{{S=360}}}
So the average of the 4 scores that add up to 360 is
{{{360/4=highlight(90)}}}