Find the sum of the first four test scores:
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- A student scored 80, 85, 90, and 95 on four tests. If he wants an average of 90 across five tests, what score must he achieve on the fifth test?
- Calculate the total score needed for an average of 90 over five tests:
- \(90 \times 5 = 450\)
- \(80 + 85 + 90 + 95 = 350\)
- Calculate the required score on the fifth test:
- \(450 - 350 = 100\)
