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cricket20 [7]
2 years ago
12

Un padre de familia de décimo corta el césped de la cancha de fútbol de nuestra institución en 10 horas. En cambio, cuando otro

padre de familia de noveno trabaja sólo corta todo el césped en 6 horas. ¿Cuánto tiempo les tomará cortar todo el césped si trabajan juntos? ¿Cuánto tiempo les tomará cortar todo el césped si Luis empieza a trabajar media hora después que Ricardo comience?
Spanish
1 answer:
nataly862011 [7]2 years ago
8 0

Answer:

Ricardo se lleva 10 horas, cada hora corta 1/10. Luis se lleva 6 horas, cada hora corta 1/6.  Trabajando juntos cada hora hacen 1/10 + 1/6 = 16/60 = 8/30

Con este denominador (30) el cesped competo comprende 30/30 por lo que el tiempo sera igual a dividor 30/30 entre 8/30  = 30 x 30 / 30 x 8 =  30 / 8 = 15 / 4

Sacando mitades  o   3 enteros 3/4  Respuesta = 3 horas con 45 minutos.

En la segunda parte: 3.2 Cuando Luis comienza a trabajar, se lleva una hora en cortar 1 /6 del cesped, pero trabajo media hora, por lo que avanzo 1 / 12. Cuando comienzan a trabajar los dos restan 11 / 12 del cesped.

Dividimos 11 / 12 entre lo que avanzan trabajando juntos = 8 / 30 y al resultado le agregamos los 30 minutos que trabajó Luis: Tiempo Total = Tiempo que trabajó Luis + Tiempo que trabajan Juntos.

El tiempo que trabajan juntos es 11 / 12 entre 8 / 30 = 55 / 16 (reduciendo) = 3.4375 3 horas + .4375 * 60 = 3 horas + 26 minutos + 30 minutos iniciales = 3 horas + 56 minutos.

Explanation:

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           Just when the American constitution was going into effect in 1789, a revolution broke out in France.  Like the American revolutionaries, the French immediately proclaimed that “men are born and remain free and equal in rights.”  But did this apply to the slaves in France’s overseas colonies?  The question was an important one.  Even though France’s colonies looked small on the map, the three Caribbean colonies of Saint Domingue (today’s Republic of Haiti), Guadeloupe and Martinique contained almost as many slaves as the thirteen much larger American states (about 700,000).  Saint Domingue was the richest European colony in the world.  It was the main source of the sugar and coffee that had become indispensable to “civilized” life in Europe.

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