jhrndz
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20. Joshua scored a 70, 80, 85, and 90 on his first four math quizzes. What 1 point
score will Joshua need to earn on his fifth quiz to have an average of 80? *

Respuesta :

altavistard

Answer:

75

Step-by-step explanation:

Let x represent the 5th score.  Then:

70 + 80 + 85 + 90 + x

---------------------------------- = 80

                  5

Then:

150 + 175 + x                           325 + x

-------------------- = 80           => ------------- = 80

           5                                          5

so that:  325 + x = 400

Thus, x = 75.

If Josh earns a 75 on his 5th quiz, his 5-quiz average will be 80.

Answer:

75

Step-by-step explanation:

so we will do the equation

[tex]\frac{70+80+85+90+x}{5} =80[/tex]

[tex]\frac{325+x}{5} = 80[/tex]

Multiply both sides by 5

[tex]5*\frac{325}{5} = 80* 5[/tex]

325 + x = 400

Subtract both sides by 325

x =75

He needs to get a 75 on his fifth quiz to have an average of 80

Please brainliest

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