Question 324916
since the average is 89 we really dont need to know what the 4 tests scores are sin 4 89's would have the same average
{{{(89+89+89+89+x)/5=90}}} multiply by 5
{{{(89+89+89+89+x)=450}}} add the 89s
{{{(356+x)=450}}} subtract 356
{{{x=94}}}
E