*alien help*???

100 aliens attended the intergalactic meeting on earth.

73 had 2 heads

28 had 3 eyes

21 had 4 arms

12 had 2 heads and 3 eyes

9 had 3 eyes and 4 arms

8 had 2 heads and 4 arms

3 had 2 heads, 3 eyes, and 4 arms

HOW MANY HAD NONE OF THESE UNUSUAL FEATURES?

5 Answers

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  • 1 decade ago
    Favorite Answer

    Wow, I'm going to use variables (h>heads, e>eyes, a>arms):

    a. 2h, 2e, 4a __ 73=a+b+c+d, 27=g+h+e+f

    b. 2h, 2e, 2a __ 28=c+d+g+h, 72=a+b+e+f

    c. 2h, 3e, 4a __ 21=a+c+e+g, 79=b+d+f+h

    d. 2h, 3e, 2a __ 12=c+d, 88=a+b+e+f+g+h

    e. 1h, 2e, 4a __ 9=g+c, 81=a+b+d+e+f+h

    f. 1h, 2e, 2a __ 8=a+c, 82=b+d+e+f+g+h

    g. 1h, 3e, 4a __ 3=c

    h. 1h, 3e, 2a __ You are looking for f (normality, or, if you like, any case that does not present the unusual features mentioned)

    c=3

    g=9-c=6

    a=8-c=5

    d=12-c=9

    e=21-a-c-g=21-5-3-6=7

    b=73-a-c-d=73-5-3-9=56

    f=72-a-b-e=72-5-56-7=4

    Please check if I am wrong.

  • 1 decade ago

    27

  • 1 decade ago

    101-you forgot to mention the invisible alien that is a hyper-intelligent shade of the color blue.

  • dlc
    Lv 4
    1 decade ago

    54 to be exact. <<smile,smile>>

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  • 1 decade ago

    NONE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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