Question 68869
:Write an expression for each statement:
:
The diameter of Earth is about twice that of Mars.
E = 2M
:
The diameter of Mars is about three times that of Pluto.
M = 3P
or
P = (1/3)M or .33M
:
 Together, the sum of the diameters of Earth, Mars, and Pluto is about 30,000 kilometers less than the diameter of Uranus.
E + M + P = U - 30000
:
Substitute for E and P:
2M + M + .33M = U - 30000
3.33M = U - 30000
:
If the diameter of Uranus is about 52,000 kilometers,
3.33M = 52000 - 30000
3.33M = 22000
M = 22000/3.33
M = 6600 km rounded off

what equation would be used to find the approximate diameter of Pluto?
:
P = (1/3)M
P = (1/3)6600
P = 2200 km
:
That's pretty close to it's diameter which is generally given as 2274 km
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