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Regla de tres: 10 ejercicios prácticos

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Regla de tres: 10 ejercicios prácticos

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Pruebas rápidas de proporciones

Created by

Oscar Gutiérrez
Oscar Gutiérrez
Bolivia

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Regla de tres: 10 ejercicios prácticos
 

Regla de tres: 10 ejercicios prácticosOnline version

Pruebas rápidas de proporciones

by Oscar Gutiérrez
1

Si 5 kg de arroz cuestan 15 Bs ¿cuánto cuestan 8 kg?

2

3 litros de pintura cubren 24 mts2. ¿Cuánto cubrirán 7 litros?

3

10 kg de material pastelero cuestan Bs. 40 ¿Cuánto costarán 25 kg?

Escoge una o varias respuestas

4

Un coche consume 6 L cada 100 km. ¿Cuánto consume en 350 km?

5

9 empleados producen 72 unidades en 1 hora. ¿Cuántas unidades producen en 3 horas?

6

A 50 km/h, ¿cuánto tiempo para 150 km?

7

4 cuadernos cuestan Bs 12 ¿Cuánto cuestan 15 cuadernos?

8

Dos tazas de arroz para 4 personas ¿Cuántas tazas para 9 personas?

9

Una máquina fabrica 120 piezas en 8 horas. ¿Cuántas piezas en 5 horas?

10

En un mapa 1:100000, 1 cm = 1 km real. ¿Cuántos km son 7 cm?

Explicación

Regla de tres simple: (8×15)/5 = 24 Bs.

Proporción directa: 7/3 × 24 = 56 m2.

Precio por kg constante: (25×40)/10 = 100 €.

Proporción: 350/100 × 6 = 21 L.

Producción es proporcional al tiempo: 72×3 = 216.

Tiempo = Distancia / Velocidad: 150/50 = 3 h.

Precio por cuaderno constante: 12/4 × 15 = 45 €.

Proporción directa: (9/4) × 2 = 4.5 tazas.

Piezas por hora = 120/8 = 15; 15×5 = 75.

Escala: 7 cm × 1 km/cm = 7 km.

 
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