Question 210717
Find the average of the three test scores and let x = the third test score.
{{{(83+92+x)/3 >= 90}}} The average on all three tests is at least 90.
{{{(175+x)/3 >= 90}}} Multiply both sides by 3.
{{{175+x >= 270}}} Subtract 175 from both sides.
{{{x >= 95}}} x is at least 95.
Lara must score: 95, 96, 97, 98, 99, or 100 on her third test.