SOLUTION: John has taken 4 math tests and has an average of 85. What must he get on the 5th test to have an average of 88?

Question 819732: John has taken 4 math tests and has an average of 85. What must he get on the 5th test to have an average of 88?

Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
( 4(85) + t )/5 = 88
4(85) + t = 88(5)
340 + t = 440
---
t = 100
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Calculate and graph the linear regression of any data set:
https://sooeet.com/math/linear-regression.php
RELATED QUESTIONS
John has taken 4 tests and has an 85% average. What must he get on the next test to have... (answered by stanbon)

Lucy has taken four tests In math and has an average of 85. What score does she have to... (answered by macston,Edwin McCravy)

Brian has marks of 75,82 and 90 on three math tests. What mark must he obtain on the next (answered by rfer)

Mark has an 80 average after 3 tests. He wants an average of 85. What must Mark make on... (answered by addingup)

John has a total of 4 tests. His scores so far are 88, 90, and 94. He has to average at... (answered by mananth,JBarnum)

Jim has grades of 84, 65, and 76 on three math tests. What grade must he obtain on the... (answered by solver91311)

Lucy is taken for tests in math class and has an average of 85. a. What's score... (answered by jorel555)

Jamie has taken three math tests. Her scores were 88, 94, and 95. To have an average of... (answered by Fombitz)

Sonya's average so far is 84 for 3 math tests. What must she get on the fourth test to... (answered by stanbon)