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14 July, 15:52

If shane mailed out 40% of his holiday cards, and he still has 18 cards left to mail, how many total cards did he have to mail?

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  1. 14 July, 17:14
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    Let x be the total number of holiday's cards:

    1st, he mailed 40% of x → 0.4x

    2nd, he still have 18 cards

    3rd, x = 0.4x + 18 → x-0.4x = 18 → 0.6x = 18 and x = 18/0.6 → x = 30
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