Puzzles for you

[sofiamarin203]

Multiply of 37 by multiplies of 3:
3 x 37 = 111
6 x 37 = 222
9 x 37 = 333
12 x 37 = 444
15 x 37 = 555
18 x 37 = 666
21 x 37 = 777
24 x 37 = 888
27 x 37 = 999


Nice one:
111.111.111 x 111.111.111 =
12.345.678.987.654.321


Trapeze:

1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
another Trapeze:

1x 8 + 1 = 9
12 x 8 + 2 = 98
123 x 8 + 3 = 987
1234 x 8 + 4 = 9876
12345 x 8 + 5 = 98765
123456 x 8 + 6 = 987654
1234567 x 8 + 7 = 9876543
12345678 x 8 + 8 = 98765432
123456789 x 8 + 9 = 987654321

and another one:

0x 9 + 8 = 8
9 x 9 + 7 = 88
98 x 9 + 6 = 888
987 x 9 + 5 = 8888
9876 x 9 + 4 = 88888
98765 x 9 + 3 = 888888
987654 x 9 + 2 = 8888888
9876543 x 9 + 1 = 88888888
98765432 x 9 + 0 = 888888888
987654321 x 9 - 1 = 8888888888
9876543210 x 9 - 2 = 88888888888

wow! Great mathematics, like them......

[Markojov]

My favorite :)
Thanks

[zut]

I saw that puzzle and I have dizzy after that

[mehmlyndsy]

Like your puzzle.

I think that boy is more then girl

[junvialabado]

try comparing your question with China's gender preference issue

[ixmawel]

HI! I'm new here... What should I do?

[smantara]

nice puzzle.
Keep sharing.

[peerapong]

So complicated

[stefan.mercep]

thase are cool... post more of them if you know...

[humararishta]

Take this scenarios, we have x families. If we assume the having a boy or a girl is equal-probable. Then x/2 families will have boys and x/2 families will have girls. Next time x/4 family will have boys and x/4 family will have girls and so on. At the end, we get (x/2+x/4+x/8+...) boys and (x/2+x/4+x/8+...) girls and the ratio is 1. This is considering we have no twins, triples,....