Maths Challenge National Final Relay Race - Ukmt Team, 2010 Page 27
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UKMT Team Maths Challenge 2010 National Final - Relay Race
B12
In 1610 Galileo discovered the four largest moons of Jupiter: Io,
Ganymede, Europa and Callisto. The mass of the Earth is
24
23
6
0 .
×
10
kg. The mass of Callisto is
. 1
08
×
10
kg.
To one decimal place, what percentage is this of the Earth’s mass?
Answer
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