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March 30, 2017

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I have an SAT Question of the Day that I'm having trouble with. The question is: Seven cards in a pile are numbered 1 through 7. One card is drawn. The units digit of the sum of the numbers on the remaining cards is 7. What is the number on the drawn card?
The answer choices are:
1
3
5
6
7

  • math - ,

    The sum of 1+2+..+7 = 28

    If after removing a card the unit digit of the sum of the remaining is 7, that sum could be either 27 or 17

    For the 17, the card removed had to be a 10, not possible.

    So the card removed was a 1
    for the

  • math - ,

    i don't know bcuz im only n da 6th grade

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