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Posts tagged with census

The Census Puzzle

September26

Delight yourself in some mathematical detective work to see if you can figure this problem out! A member of a census organization is going door-to-door collecting information. He comes to a house where a woman answers the door. After introducing himself, he asks her how many adults live in the house. “Just me,” she replies, […]

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Australia Welcomes the 23rd Million…

April22

It was a big night for Australia last Tuesday. According to the Australian Bureau of Statistics’¬†population clock, just after 10.15pm someone stepped off a plane or a baby was born to become the 23rd million Australian. Baby 23,000,000, you have won the equivalent of the global lottery by being born here.¬† Using quarterly demographic updates […]

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Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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