If you add 5 to 1/3 of a number, the result is 1/2 of the number. What is the number?

Step-by-step explanation:

5 + x/3 = x/2

x/2 - x/3 = 5

3x/6 - 2x/6 = 5

x/6 = 5

x = 30

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours