Physics ratio between the moon and the planet?

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LuiG101

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A planet's radius is 7169 km and it has a moon of radius 1380 km. The acceleration of gravity at the surface of the planet is 10.95 m/s2 and the acceleration of gravity at the surface of its moon is 1.24 m/s2. What is the ratio of the average density of the moon to that of the planet?
 
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