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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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Each set of numbers below represents the lengths of three line segments. Which set represent line segments that could be connect
LenKa [72]

Answer:

B is the triangle

A and E can be thought of as triangles as well with angles 0°, 0° and 180°, but it will be just a line with 3 points. So it depends whether this is a question with multiple answers or not.

Step-by-step explanation:

  • Thinking Process:

We need to find a formula for a triangle that uses all the sides

Cosine rule uses all sides:

c^2 = a^2 + b^2 -2ab(cosA)

we can rearrage this formula and make the angle A the subject:

A = cos^{-1}(\frac{a^2+b^2-c^2}{2ab})

  • now you can just put the values from each option in the question into this formula and see if it gives an answer or not.

<u>Try A. (1,2,3)</u>

put a = 1, b = 2, c = 3 (keep in mind that you can take 'a' 'b' and 'c' as 3,2 and 1 or any other arrangement within the option A(1,2,3). All we are doing here is checking whether the answer exists or not)

A = cos^{-1}(\frac{1^2+2^2-3^2}{2(1)(2)})

A = 180, now graphically it seems that this is just a line with 3 points, or technically you can think of as the sides of the triangle are overlapping each other, and the angle between the sides is 0 0 and 180. It depends on whether the question is asking you to be technical or not. Since the question already stated there are 3 line segments, so we can think of it as a triangle.

<u>Try B.(3,4,5)</u>

A = cos^{-1}(\frac{3^2+4^2-5^2}{2(3)(4)})

A = 90, this is a triangle (specifically, this is a right angled triangle)

<u>Try C.(1,10,100)</u>

A = cos^{-1}(\frac{1^2+10^2-100^2}{2(1)(10)})

from the calculator you'll see a 'math error', this shows that there is no answer, because cos^{-1} can only accept values within -1 and 1 inclusive. Hence no such triangle exists with lengths (1,10,100).

Similarly you can try the formula with all other options, and find whose answers exists or not.

Finally, to complete the answer, let's

Try E.(1,3,4)

A = cos^{-1}(\frac{1^2+3^2-4^2}{2(1)(3)})

A = 180, hence this is also one of those "3 points on a straight line  triangles" similar to A(1,2,3)

so the answer is either A,B and E OR just B

Hope this helps :)

5 0
3 years ago
How to do this question plz answer me step by step plzz ​
finlep [7]

Answer:

30, 85, 95, 150

Step-by-step explanation:

The angles of a quadrilateral add to 360

Let x be the smallest angle

x+55

x+65

x+120 are the other three angles

Add the 4 angles together and they sum to 360

x+x+55 x+65+ x+120 = 360

Combine like terms

4x+240 = 360

Subtract 240 from each side

4x+240-240 = 360 -240

4x = 120

Divide by 4

4x/4 = 120/4

x = 30

x+55= 30+55 = 85

x+65 = 30+65 = 95

x+120 = 30+120 = 150

7 0
3 years ago
Someone started reading at 8:18 they fineshed at 8:57 how many min did they nead
Karo-lina-s [1.5K]

They read for 39 minutes as that is the difference in time from when they started to when they finished.

7 0
3 years ago
Read 2 more answers
Explain how to show the multiplication of 3 and -4 on a number line
hichkok12 [17]

The multiplication of 3 and -4 on a number line is shown

<h3><u>Solution:</u></h3>

The number line representation is shown below

On number line the points are at equal distances

The multiplication of 3 with -4 can be understood in the following way:-

a × b , means a jumps b times

Eg :-  3 × -4 means 3 jumps -4 times

Which basically mean we are going to move 3 number  per step , and we are going to do this 4 times and –ve sign indicates we will move in negative direction

Therefore,

So, when we move from 0 , when we take first step we reach -3 , in next step we reach -6 , in next we reach -9 and in the last step we reach -12

Which is the product 3 and -4 .i.e. 3 \times 4 =-12

6 0
3 years ago
How can 65% be broken down with friendly percents to find 65% of a number?
Dmitrij [34]

Answer:

The correct ans would be B, 25%+10%+10%+10%+10%

Step-by-step explanation:

When percentages are found, the best way to calculate them is to break them down to the simplest percentage form, and 10% is the simplest percentage that a person can calculate of whatever digit. So if someone wishes to find out the friendly percents, then the easiest would be to calculate the 10% of the figure, add them four times, then add them 2 times plus the half of 10%, which will become 25%, and then add them all to get the 65% of that figure.

8 0
3 years ago
Read 2 more answers
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