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erik [133]
4 years ago
12

Working together, Greg and Cindy can clean the snow from the driveway in 12 minutes. It would have taken Cindy, working alone, 2

8 minutes. How long would it have taken Greg alone?
Social Studies
2 answers:
dmitriy555 [2]4 years ago
5 0

Answer: Greg alone will clean the snow in 21 minutes

Explanation:

From the question, Greg + Cindy can clean the snow in 12 minutes

Cindy working alone is able to clear the same quantity of snow in about 28 minutes.

Now, Greg + Cindy ------ 12

Cindy alone ------ 28

we'll simply reduce 28/12 to its lowest term and we should have 7/3

It's very logical that two people can execute a task in less time than just one person as long as all are working at the same rate and in the same conditions.

Let's now take 7 joules as the sum of Greg and Cindy's energy and 3 joules as the quantity of Cindy's energy alone. Greg's supposed quantity of energy should be - (7-3 = 4 joules).

Therefore, Greg's + Cindy's energy/ 7joules of energy can be used to execute a task in 12 minutes. Greg's energy alone/ 4joules of energy can execute a task in ? minutes

7 joules -------- 12 minutes

4 joules -------- ? minutes

= 7/4 × 12 = 21 minutes

This means that Greg is able to clean the snow in 21 minutes

ExtremeBDS [4]4 years ago
4 0

Answer:

21 minutes

Explanation:

1/28+1/X=1/12

1/X=1/12-1/28

1/X=(28-12)/12*28

1/X=16/336 CROSS MULTIPLY.

16X=336

X=336/16

X=21 minutes for Greg alone.

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The correct answer is this one: "C. <span>ACCGUGAGGUC."</span>
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