Question

The planet mercury takes 56.6 earth days to rotate once around its axis. About how many times does it rotate around its axis during one earth year?

Answer 1

In 56.6 earth days , it rotates 1 time
so, in 1 earth day , it will rotate $\frac{1}{56.6}$ times

now, In a earth year, there are 365 days.

So, in 365 earth days, it will rotate  =  $\frac{1}{56.6} \times 365 = 6.44$