Glenn needs 20 minutes to clean his room. if his little sister veronika pulls things out while he is cleaning, it takes 60 minutes for him to clean the room. how many minutes does it take for veronika to pull everything out?

The rate of Glenn in finishing a job would be equivalent to:

Rate (G) = 1 job / 20 minutes

While the rate of Veronika is:

Rate (V) = 1 job / x                 ---> x is the unknown

Where 1 job for Glenn means completely cleaning his room while 1 job for Veronika means pulling out everything. Therefore the equation to use would be:

1 / 20 – 1 / x = 1 / 60

The rate of Veronika is subtracted from the rate of Glenn since Veronika is slowing Glenn down. Solving for x:

Multiply both sides by 60 x

(1 / 20 – 1 / x = 1 / 60) * 60 x

3 x – 60 = x

2 x = 60

x = 30

Therefore it takes 30 minutes for Veronika to pull everything out.

Surface-area. If a solid is composed of flat surfaces, such as the cube on the right, the surface area is simply the sum of the areas of the flat surfaces (called faces). So, for example, if a each edge of a cube has a length s, the area of one face is s2 since it is a square.

Step-by-step explanation:

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