book Maths Puzzle Numerical Ability

Can someone help me with this problem?

Write the ratio 5 to 9 as a fraction.

Thanks,
Sher

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book Other Question

The diameter of the Milky Way disc is approximately 9 x 10^20 meters. How long does it take light, traveling at 10^16 m/year to travel across the diameter of the Milky Way?

Thank You. 3X3+3X2-27X-27