# maths,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

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.

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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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• 2. 46

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• 1)2

2)51

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• (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. x+(x+1)+(x+2)-4x = 1

x = 2

2. 12+5=x/3

x = 51

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• 1. 2,3,4

2. 46

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• 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&#39;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)??

2)46

Source(s): 張滿鎏
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