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5 * preguntas acertadas - 3 * preguntas falladas = 69
5x - 3* (25 - x) = 69
5x - 75 + 3x = 69
8x = 69 + 75
8x = 144
x = 144 : 8
x = 18
18 serian respuestas acertadas
25 - 18 = 7 serian respuestas fallidas
Verificamos
5 * 18 = 90
3 * 7 = 21
90 - 21 = 69