80% is equivalent to what fraction in reduced terms

Hello from MrBillDoesMath!

4/5

Discussion:

80% =                      => percent means "per 100"

80/100=                  => 80 = 8 * 10; 100 = 10 * 10

(8*10)/(10*10) =       => cancel 10 from numerator and denominator

8/10 =                      => divide numerator and denominator by 2

4/5

Thank you,

MrB

The correct answer is 4/5.

Step-by-step explanation:

100% - 80% = 20%

This is 1/5.  100 ÷ 20 = 5

So, 20 x 4 = 80 ÷ 20 = 4

Remember, each 20%, that is 1/5.  So, 4 x 1/5 = 4/5.  

80% = 4/5

this answer is !

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