Question

Sam and you are going to paint your room together.

Sam takes 10 minutes to paint 25 square feet.
It takes you 5 minutes to paint 25 square feet.
Sam says, "If we paint together, then it will take 15 minutes for us to cover
feet."
TI
of
Give an explanation to convince Sam that she is incorrect.
.

Answer 1

Sam 's thinking is incorrect.

Explanation:

Because If Sam takes 10 minutes to paint 25 square feet, then 5 minutes will be paint 12.5 sf... So if 15 minutes will paint 37.5 square feet. (by Sam)

---For me: if 5 mutes to paint 25 square feet.--->10 minutes will be 50 sf---> then 15 minutes will paint 75 square feet...

So If Same and I paint together will be 12.5 + 75 = 112.5 square feet
---Not 50 square feet...

What Sam says is incorrect....He can't add times together., that' s wrong.

Answer 2

Sam is incorrect because you would not add the two times together. Hence there being 2 people working it would take you guys less time. You would actually subtract the times to get 5 minutes

Explanation: