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Solving Age Problems Part Two

Updated on September 8, 2011

Solving Age Problems Part Two


This hub is a sequel to my hub “Solving Age Problems.” In this hub I present additional four problems with their solution. I hope you will enjoy this.


Problem Number One :

Andr ewis nine year older than three timeshis son’s age. In fifteen years, the age of Andrew will be six years more than twice his son’s age. Find their present ages.

Solution :

Representation:

LetX= Son’s age

3X + 9= Andrew’s age

Their ages in 15 years or fifteen years from now

X + 15= Son’s age

3X + 9 + 15 = 3X + 24= Andrew’s age

Working Equation:

3X + 24= 2(X + 15) + 6

3X + 24= 2X + 30 + 6

3X – 2X= 36 – 24

X = 12= Son’s age

3X + 9 = 3(12) + 9= 45 = Andrew’s age


Problem Number Two :

Linda is two thirds as old as Francis. In five years, the sum of their ages will be fifty years. Find their present ages.

Solution :

Representation :

Let X = Francis age

2/3 X = Linda’s age

Their ages in five years

X + 5= Francis age

2/3 X +5= Linda’s age

Working Equation :

X + 5 + 2/3 X + 5= 50

X+ 2/3 X + 10 = 50

X + 2/3 X = 50 -10

( X + 2/3 X= 40) 3

3X + 2X=120

5X= 120

5X /5=120/5

X= 24= Francis age

2/3 X = 16= Linda’s age


Problem Number Three :

In eight years ,Alvin will be three times as old as he was eight year ago. How old is Alvin now ?

Solution :

Representation :

Let X = Alvin’s age

X + 8 = Alvin’s age in 8 years

X – 8+ Alvin’s age eight years ago

Working Equation :

X + 8 = 3 (X – 8)

X + 8= 3X -24

X -3X = -24 – 8

-2X= -32

-2x/-2= -32/-2

X = 16

Alvin is sixteen years old now.


Problem Number Four:

A man who is 42 years old has a daughter who is 12 years old. In how many years will the father be twice as old as his daughter ?

Solution:

Man’s present age= 42

Daughter’s present age= 12

LetX = In how many years will the father’s age be equal to twice his daughter’s age

Their ages in X years from now

42 + X= Father’s age

12 + X= Daughter’s age

Working equation :

42 + X= 2 (12 + X)

42 + X= 24 + 2X

X – 2X= 24 -42

(-X= - 18 ) -1

X = 18

In eighteen years, Father’s age will be twice his daughter’s age.


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    • cristina327 profile image
      Author

      Maria Cristina Aquino Santander 6 years ago from Manila

      Hi carcro thank you for dropping by and appreciating this hub. Your visit is much appreciated. I am glad you find this hub interesting. blessings to you always. Best regards.

    • cristina327 profile image
      Author

      Maria Cristina Aquino Santander 6 years ago from Manila

      Hi kerlynb it is nice to hear from you again. Thank you for gracing and appreciating this hub. your comments and visit are much appreciated. Blessings to you always. Best regards.

    • profile image

      Raymond Tremain 6 years ago

      to carcro well to look younger what i do is to eat only the best food, many ask how old I am as they think I'm only around 55 but I say add on another 23 and you be right.

      its what you eat counts as I eat no meat at all

      cristina you are funny how did you work out all this??haha

    • carcro profile image

      Paul Cronin 6 years ago from Winnipeg

      I was thinking this about how to look younger, lol, which I could really use. The math, not so much...but very interesting none the less!

    • kerlynb profile image

      kerlynb 6 years ago from Philippines, Southeast Asia, Earth ^_^

      Another slam-dunk, math-related article from you! Congratulations! These word problems are the same ones I had to answer back in elem. If my teachers had only explained it as clearly as you did... Argh! :(

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