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dlinn [17]
3 years ago
9

Seven men have seven wives each man and wife have seven children what are the number of people?

Mathematics
1 answer:
stealth61 [152]3 years ago
5 0

Answer:

21 people

Step-by-step explanation:

given data

men = 7

wife = 7

children = 7

solution

As given each man and each wife means a couple

and they have 7 children

so

a total of 7 couples has had 1 child each

This makes it 7 Men + 7Wives + 7 Children = 21 People  

Therefore

here total people is 7 Men have 7 Wives Riddle is 21 People

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Step-by-step explanation:

This may not be the right answer, but its what I think it is.

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3 years ago
a box with a square base and open top must have a volume of 70304 c m 3 cm3 . we wish to find the dimensions of the box that min
Dmitriy789 [7]

The box should have base 52 cm by 52 cm and height 26 cm.

What is volume?

A three-dimensional space's occupied volume is measured. It is frequently expressed as a numerical value using SI-derived units, other imperial units, or US customary units. Volume definition and length definition are connected.

The Volume of a box with a square base x by x cm and height h cm is

V = x^2h

Since the surface area directly affects the amount of material used, we can reduce the amount of material by reducing the surface area.

The surface area of the box described is  A = x^2 + 4xh

We need A as a function of x alone, so we'll use the fact that

V = x^2h= 70304 cm^3

⇒ h = \frac{70304}{x^2}

So, the area becomes,

A = x^2+4x(\frac{70304}{x^2})\\ A = x^2 + \frac{281216}{x}

We want to minimize A, so

A' = 2x - \frac{281216}{x^2} =0\\\frac{2x^3-281216}{x^2}=0\\ {2x^3-281216} = 0\\x^3 - 140608=0\\x^3 = 140608\\x = 52

The second derivative test verifies that A has a minimum at this critical number:

A'' = 2+\frac{562432}{x^3}  which is positive at x = 52.

Now,

h = \frac{70304}{x^2}= \frac{70304}{(52)^2}=26

Hence, The box should have base 52 cm by 52 cm and height 26 cm.

To know more about volume, click on the link

brainly.com/question/463363

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Answer:

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a= 5r^2 t

Divide each side by 5r^2

a/ 5r^2 = 5r^2 t/5r^2 t

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