Quinn has solved 20 problems on the math quiz. If this is 80% of the problems on the quiz, how many more problems does he have left to solve

5 problems

Step-by-step explanation:

20=%80

10=%40

5=%20

100-80=20

20+5=25

5 problems left

ruth is 6 years old

step-by-step explanation:

6 + 24 = 30,   so 6/30 = .2  

if you do 1/5 it also equals .2, so that is the answer.

whole numbers.

step-by-step explanation:

we are given the average monthly rainfall (in millimeters) model r(m) for the years 1900-2009 as a function of the month number m.

as we can see m is taken for the number of months for years 1900-2009.

we know that number of months can't be a negative number or decimal number or a fraction.

so, the number of months could be only positive whole numbers.

therefore, whole numbers is more appropriate for the domain of r.