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Vaselesa [24]
3 years ago
7

It takes 45 minutes for 4 people to paint 5 walls.How many minutes does it take 6 people to paint 4 walls?

Mathematics
1 answer:
vodka [1.7K]3 years ago
4 0
   45 min. - 4 peoples - 5 walls 
     ? min. - 6 peoples - 4 walls
-------------------------------------------
180 min. - 1 man - 5 walls ⇒
  36 min. - 1 man - 1 wall ⇒
    6 min. - 6 peoples - 1 wall ⇒
  24 min. - 6 peoples - 4 walls (answer)

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Explanation:

Choice A isn't the answer because we don't know anything about the angles, so we can't use the AA (angle angle) Similarity theorem.

Choice B isn't the answer because we don't have info about all three pairs of sides (we only have two pairs of sides).

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3 years ago
A class contains 10 sophomores, 15 juniors, and 20 seniors. A committee of 5 students is to be chosen. Each student is equally l
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Answer:

P(A) = 0.1620 , P(A|B) = 0.0707

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P(A) , exactly 3 juniors selected = (15 c 3) (30 c 2) / (45 c 5) = (455 x 435) / 1221759 = 0.1620  

P (B) , exactly 2 seniors selected = (20 c 2) (25 c 3) / (45 c 5) = (190 x 2300)/ 1221759 = 0.3576

P(A|B), exactly 3 juniors & exactly 2 seniors selected = P (A∩B) / P (B)

(15 c 3) (20 c 2) / (45 c 5) = (455 x 190) / 1221759 = 0.0707

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Step-by-step explanation:

only my best guess

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Answer:

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Step-by-step explanation:

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