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It takes the earth 1.0 year to travel around the sun. It takes Venus 0.615 years to orbit the sun. If the planets are in a straight line with the sun now, how long will it take before this is the case again?

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#### Solution Preview

Let x be the number of years it takes before the planets are in the straight line with the sun again.

Then x/(0.615) is the number of times that Venus travels around the sun, and

x/(1.0)=x is the number of times the ...

#### Solution Summary

This shows how to determine the length of time between alignments of planets. The revolution around the sun is examined.

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