if you want to buy 100 hens, roosters and chickens for 100 dollars (we used another money system but who cares XD)
you have to but at least one of each kind and you're not allowed to use less money or more so the exact amount.
1 chicken costs 0,50 dollars
1 hen costs 3 dollars
1 rooster costs 5 dollars
you can buy 88 chickens (44 dollars), 2 hens (6 dollars) and 10 roosters (50 dollars)
we got the one to calculate at by out grandfather yesterday
that one was nomemory's calculation (i didn't solve it since i'm bad at math)
and grandfather showed us how he had calculated it, but now that i was about to write it down here... i noticed it was wrong..
94 chickens (47 dollars)
1 hen (3 dollars)
5 roosters (50 dollars)
it just doesn't fit since 5 times 5 isn't 50, it's 25 D: >.<
so my dear sister is better then our precious grandfather

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