exam Maths Puzzle Numerical Ability

Assuming that a planet is a perfect sphere with a circumference of 20771 km and an average density of 2.41 g/mL, what is its approximate mass?

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A circle whose equation is (x+5)^2+(y+3)^2=36 is stretched by a factor of 1/4. What is the new equation? I think it is (x+5)^+(y+3)^2=9/4 ?????? Can someone please help me??? A wooden model galleon is built using a 1:90 scale. The length of the model is 520 millimeters and the height is 615 millimeters. Solve the proportions to find the actual length and height of the galleon.