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1)The sum of three consecutive numbers minus 4 times the smallest number equals 1.Find the three number.

2)Andy is now 12 years old.5 years later,Andy will be1/3 as old as his mother.Find the age of his mother now.

8 Answers

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  • MARCO
    Lv 7
    1 decade ago
    Favorite Answer

    1)The sum of three consecutive numbers minus 4 times the smallest number equals 1.Find the three number.

    Let the smallest number be x, then(x+1),(x+2),

    x+(x+1)+(x+2)-4x=1

    -x+3=1

    -x=-2

    x=2

    so the smallest number is 2

    the(2+1)=3

    then(2+2)=4

    2)Andy is now 12 years old.5 years later,Andy will be1/3 as old as his mother.Find the age of his mother now.

    let x be the age of his mother

    (12+5)=(1/3)x

    17=x/3

    x=51

    so the age of his mother is 51-5=46

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  • 1 decade ago

    2. 46

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  • 1 decade ago

    1)2

    2)51

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  • 1 decade ago

    (1) They are 1, 2, 3

    Let X = the smallest numbr

    X + (1+X) +(2+X) -(4X) = 1

    X = 2

    (2) Andy's mother is now 46.

    Let Andy' mother age is y now.

    (12 + 5) = 1/3 X ( y + 5)

    17 = 1/ 3 y + 5/3

    17 - 5/3 = 1/3 y

    3(17-5/3) = y

    51 - 5 = y

    y = 46

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  • 1 decade ago

    1. x+(x+1)+(x+2)-4x = 1

    x = 2

    2. 12+5=x/3

    x = 51

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  • 1 decade ago

    1. 2,3,4

    2. 46

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  • 1 decade ago

    let x be the smallest number

    x+(x+1)+(x+2)-4x=1

    3-x=1

    x=2

    let x be the age of Andy's mother age

    (x+5)/3=12+5

    x+5=51

    x=46

    2006-10-16 16:24:25 補充:

    1) the three numbers are 2,3,4

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  • 1 decade ago

    1)??

    2)46

    Source(s): 張滿鎏
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