Question 666440
Given her 83 average on the first three tests, solve for her total points on those tests...
{{{y/3 = 83}}}
Multiply both sides by 3
y = 249 total scores of tests 1, 2 and 3
...
Having 249 accumulated on the first three tests, solve for the score needed on the fourth test for an average of 86...
{{{(249+x)/4 = 86}}}
Multiply both sides by 4
249 + x = 344
Isolate x
x = 344-249
{{{highlight_green(x = 95)}}} is needed on the fourth test
.....................
Delighted to help.
-Reading Boosters
Wanting for others what we want for ourselves.
www.MyHomeworkAnswers.com