Math (Algebra 1)

Juan’s first 3 exam scores are 85, 93, and 87. What does he need to score on his next exam to average 90 for all 4 exams?

let x represent the score on his next exam

(put this in a multi-step equation)

PLEASE HELP

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  3. 👁 438
  1. an average of 90 on 4 exams means 4*90=360 points in all.

    So, how many points shy of 360 is the sum of the first three tests?

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    2. 👎 0
  2. 95

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    2. 👎 0
  3. Jose wants to have an average of 80 for his 4 exams. Each exam is scored on a scale of 0 to 100. His first three exam scores are: 87, 72, 85. What does Jose need to score on the 4th exam to have a mean of 80 on all 4 exams?

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