math
posted by Diana .
i had cards to write, i wrote 1 third of cards on monday, 2 eighths on tuesday, 1 sixth on wednesday and wrote the remaining 27 cards on thursday. how many cards did i write?

number of cards  x
so ...
x/3 + x/4 + x/6 + 27 = x
times 12
4x + 3x + 2x + 324 = 12x
3x = 324
x = 108
check:
108/3 + 108/4 + 108/6 + 27
= 36+27+18+27
= 108
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