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yuradex [85]
2 years ago
6

5 men take 45hours to build a wall.how long will it take 9men working at the same wall?​

Mathematics
1 answer:
Karolina [17]2 years ago
7 0

Answer:

<u>25 hours</u>

Step-by-step explanation:

It takes 5 men 45 hours to build a wall.

So, if no. of men increases by 1.8 [∴ 5 x 1.8 = 9],

then time taken reduces by that same amount.

=> 45 hours / 1.8

=> 45 / (9/5)

=> 45 x 5 / 9

=> 5 x 5

=> <u>25 hours</u>

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C(x) = 400 + 20x - 0.2x²

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Marginal cost is how much it would cost to make one MORE of the same product so now we find how much it costs to produce 31 radios and compare the two. 

c(31) = 400 + 20(31) - 0.2(31)²

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To compare we can also do 29 radios. 

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