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Numero impar: 2x + 1
múltiplo de 5:
5 * (2x + 1) = 10x + 5
entonces:
20 < 10x + 5 < 30
le restamos 5
20 - 5 < 10x + 5 - 5 < 30 - 5
15 < 10x < 25
multiplicamos por 1/10
15 * (1/10) < 10x * (1/10) < 25 * (1/10)
1.5 < x <2.5
Entonces el valor de x = 2
Por tanto el numero es :
5 * (2x + 1) = 5 * (2 * (2) + 1) = 5 * (5) = 25