Question

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Answer 1

4.

Precio del regalo = x

10 h -------- s/. 120 + x

6 h --------- s/. 80 + x

10 / 6 = (120 + x) / (80 + x)

5 / 3 = (120 + x) / (80 + x)

5(80 + x) = 3(120 + x)

400 + 5x = 360 + 3x

5x - 3x = 360 - 400

2x = - 40

x = - 20, resultado negativo, no es respuesta

Si fuese s/. 60 mas el regalo en vez de s/. 80 mas el regalo

Precio del regalo = x

10 h -------- s/. 120 + x

6 h --------- s/. 60 + x

10 / 6 = (120 + x) / (60 + x)

5 / 3 = (120 + x) / (60 + x)

5(60 + x) = 3(120 + x)

300 + 5x = 360 + 3x

5x - 3x = 360 - 300

2x = 60

x = 30

x = s/. 30