[ENEM 2024] 137 📘 ARITHMETIC MEAN When calculating the average of his grades in 4 tests, a student

[137] When calculating the average of his grades in 4 tests, a student mistakenly divided the sum of the grades by 5. As a result, the average obtained was 1 unit lower than it should have been, if it had been calculated correctly.
The correct value of the average of this student's grades is
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ENEM 2024 - Math Test Solved by Prof. Caju.
Question 137 of the Blue Test - ENEM 2024
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[@AnysampaioAlves]

Excelente explicação, obrigada!

[@cauenarciso3664]

Obrigado, professor. Tu ajuda muito

[@__limaa085]

X + X + X + X = X-1
5
X+X+X+X = 5(X-1)
4X = 5X -5
5 = 5X - 4X
5 = X
5+5+5+5
4
20/4 = 5
Essa resolução também está certa, professor?

[@pedrooliveira-um6bf]

Fiz assim tb