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Math7

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Yuki made cookies on Monday. Some friends came over and ate half the cookies on Tuesday. On wednesday,Yuki ate three cookies, and on Thursday, she took two cookies to school. By Friday, Yuki had seven cookies left. How many did she bake on Monday?

Please i need help

  • Math7 - ,

    x = number of cookies

    x - (1/2 x + 3 + 2) = 7
    x - (1/2 x + 5) = 7
    2/2 x - 1/2 x - 5 = 7
    1/2 x - 5 = 7
    1/2 x = 12
    multiply both side by 2
    x = 24

  • Math7 - ,

    Thank you!
    I did one exercise and could you please check it

    The temperature at 2:00 P.M was 19C. By midnight, it was -3C
    What is the difference in the temperatures?
    _____________=________
    I thing the answer is:
    (+19)-(+22)=-3
    Correct?

  • Math7 - ,

    Correct?

  • Math7 - ,

    How can a difference between 19 and - 3 be only 3 degrees?

  • Math7 - ,

    From 19C to -3C is 22 degrees difference

  • Math7 - ,

    Thank you!!

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