ElectricPavlov

You doubled the people ...and you doubled the walls     time should still be 28 min

 (7people x 28 min)/7 wall          /   ( 14 people / 14 wall)  =  28 min

Seriously ?  TWENTY questions posted today?   Go away.....we are not here to do your homework !!!!   

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Of the peope who like tea    47 are women   26 are men      47/(47+26) = 47/73

Diameter is just   2 x radius   

circumference = pi  x  diameter   that you found in the first step above.....

a/b  x   b/c   =   3/4  x  8/9  = a/c = 24/36    =  a/(a+6)

                                                        24(a+6) = 36 a          24a + 144 = 36a      a = 12        a/b =3/4    12/b= 3/4     b= 16

                                                                                                                                            a/c =24/36    12/c = 24/36    c = 18

12 + 16 + 18 =46 cm

A ratio of 1:2 divides the line in to   1/3  and 2/3      The distance   A to B is 1/3    

   look at the x coordinate of A and B    -9   to  -4   is   1/3     a distance of  5      2/3 would be  10 added to the -4  = 6

                     y coordinate     A  to  B     -7  to  - 6    is 1/3      a distance of 1       2/3 would be  2 more added to B  -6 + 2 = -4

C is  (6,-4) 

C     'and '    repalces the comma in listings like this....

Keep me posted what you find.....   

From NEGATIVE 10000 to 10 ?    There are none between -10 000 and 0      (maybe you will say 0 is a perfect square)

    from 0 to 10   there is    1      4   and  9            THREE      ( or  FOUR if you include  ' 0 ' )