Question 391180
Let {{{x}}} = the grade he must get on last test
The sum of his scores on the 1st 5 tests is {{{5*94 = 470}}}
because the formula for average is (sum of scores)/(# of tests) = average
{{{(470 + x)/6 = 93}}}
{{{470 + x = 6*93}}}
{{{x = 558 - 470}}}
{{{x = 88}}}
He must get at least an 88
check:
suppose he got an 87?
{{{(470 + x)/6 = 93}}}
{{{(470 + 87)/6 = 93}}}
{{{557/6 = 92.83}}}
He wouldn't get an A