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Since you have the answer, the easiest way to work with this is to work with real numbers and break it down. What are the knowns?

Rose + 25 = Dad

10 + 25 = 35 (today)

5 years ago, Dad (then 30) was 2x old as Rose will be 5 years from now (+5), or (30/2) -5 = 10

You can also put this into formulas

Rose + 25 = Dad

Dad - 5 = 2 * (Rose + 5)

So, if Dad = Rose + 25, you can substitute one for the other in the 2nd formula, like so:

(Rose + 25) - 5 = 2 * (Rose + 5)

Rose + 20 = 2 * (Rose + 5)

Now, you can solve for Rose and eventually come up with 10

I hope this helps.

Posted on Jul 21, 2008

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Posted on Jan 02, 2017

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let c = cory's age now
let s = her sisters age now

cory's age now = sisters age + 6 years

=> c = s + 6

4 years ago, cory was 4 years younger ( i.e. c-4) and her sister was 4 years younger (s- 4)

4 years ago cory was 4 times older than her sister

=> c - 4 = 4*(s-4)

We can simplify this to c = 4s - 16 +4 c = 4s - 12

We can then use simultaneous equations to solve the two equations

(i) c = s + 6 (ii) c = 4s - 12

If we multiply both sides of equation (i) by 4 we get (iii) 4c = 4s + 24

We can then subtract equation (ii) from equation (iii) to eliminate the '4s' term => ( 4c = 4s + 24 ) - (c = 4s - 12) => 4c - c = 4s +24 - 4s +12 => 3c = 4s - 4s +36 => 3c = 36 => c = 36/3 => c = 12 => Cory's age now = 12

__For clarity:__
Her sister's age now is of course 6
4 years ago Cory would of been 8 and her sister would of been 2

I hope this helps and good luck! If you have more questions - ask away!

Please take the time to rate this answer

Many Thanks Don.

cory's age now = sisters age + 6 years

=> c = s + 6

4 years ago, cory was 4 years younger ( i.e. c-4) and her sister was 4 years younger (s- 4)

4 years ago cory was 4 times older than her sister

=> c - 4 = 4*(s-4)

We can simplify this to c = 4s - 16 +4 c = 4s - 12

We can then use simultaneous equations to solve the two equations

(i) c = s + 6 (ii) c = 4s - 12

If we multiply both sides of equation (i) by 4 we get (iii) 4c = 4s + 24

We can then subtract equation (ii) from equation (iii) to eliminate the '4s' term => ( 4c = 4s + 24 ) - (c = 4s - 12) => 4c - c = 4s +24 - 4s +12 => 3c = 4s - 4s +36 => 3c = 36 => c = 36/3 => c = 12 => Cory's age now = 12

I hope this helps and good luck! If you have more questions - ask away!

Please take the time to rate this answer

Many Thanks Don.

Sep 13, 2011 | Sunburst My Mathematical Life Single...

5 - 6 years difference is ok, once both parties are about 26 and 21. But a 20 year old dating a 14 year old is not to cool. Ether way, older boy or girl, there is a since that the older one can't communicate on their own level. If the younger of the two is far more mature for their age they will miss things that happen when dating a person of their own age. The mom and dad of the younger of the couple will loose some control; being the older one will feel as they can handle things on an adult level. It will be hard to set boundaries that the older one will stick with, but the younger should live by. Such as in by a set time, homework, projects for school. The older of the couple will push for their time "alone" which will take from the younger of the two tending to their duties. Sorry, put your foot down and save a lot of drama in your future, just say "NO, NO, NO".

Aug 30, 2011 | Tatung CLT-L50 15" Flat Panel LCD Monitor

So the father is 3 times as old as his daughter.

Let F represent the age of the fatherLet D represet the age of the daughter

So we know from the first sentence,

F = 3 * D

From the second sentence, 12 years from now the father is 1 year les than twice his daughters age,

First, lets assume it's not 12 years from now (to avoid confusion), we would haveF + 1= 2 * D

But since its 12 years from now, we have to add 12 to both ages

(F + 12) + 1 = 2 * (D + 12)

Let's simplify a bit,

F + 13 = 2 * D + 24F = 2D + 11

Now we have to solve these two equations together, we can plug the first equation into the second,

F = 3 * DF = 2 * D + 11

3 * D = 2 * D + 11D = 11

So the daughter is 11 years old, we can find out how old the father is by plugging into the first equation

F = 3 * DF = 3 * 11F = 33

So the father is 33 and the daughter is 11.

Let F represent the age of the fatherLet D represet the age of the daughter

So we know from the first sentence,

F = 3 * D

From the second sentence, 12 years from now the father is 1 year les than twice his daughters age,

First, lets assume it's not 12 years from now (to avoid confusion), we would haveF + 1= 2 * D

But since its 12 years from now, we have to add 12 to both ages

(F + 12) + 1 = 2 * (D + 12)

Let's simplify a bit,

F + 13 = 2 * D + 24F = 2D + 11

Now we have to solve these two equations together, we can plug the first equation into the second,

F = 3 * DF = 2 * D + 11

3 * D = 2 * D + 11D = 11

So the daughter is 11 years old, we can find out how old the father is by plugging into the first equation

F = 3 * DF = 3 * 11F = 33

So the father is 33 and the daughter is 11.

Jul 19, 2011 | Computers & Internet

well there are two ways:

- u can request ur network operator to give u the unlocking code.[xpensiv]

or

- u can go to a mobile hardware repair shop and get ur mobile unlocked by a box device.[cheap]

- u can request ur network operator to give u the unlocking code.[xpensiv]

or

- u can go to a mobile hardware repair shop and get ur mobile unlocked by a box device.[cheap]

Mar 02, 2011 | Apple Cell Phones

Hahahaha, Aaala!
Kafi sochna para, is tarha ho ga mere khyaal se;

140 Saal teenoN ki mila k banti hay;

Pota:** 7Years**

Baap:**49Years**

Dada:**84Years**

**7+49+84 = 140 (Theek)**

Pota kitnay Month ka = 7 x 12 = 84 **=>** Dada ki umer in years** (Theek)**

Pota kitnay Din ka = 7 x 365 = 2555din **=>** Baap ki umer in weeks [ (49x365) / 7 ] = 2555 (**Ye be Theek**)

*Concerned, Nooh bin Sikander*

140 Saal teenoN ki mila k banti hay;

Pota:

Baap:

Dada:

Dec 18, 2010 | Computers & Internet

Nov 09, 2010 | Health & Beauty

X= (1/2)M + 3
2 + X + 20 = M - 6

The father statement is not needed.

Two variables, with two equations. Solve for X.

The father statement is not needed.

Two variables, with two equations. Solve for X.

Sep 29, 2010 | Cameras

Paul 3 years younger to his friend peter. In seven years, the product of their ages would be 5 more than the product of their ages 5 years ago. How old are they now?

Oct 31, 2008 | Texas Instruments TI-30XA Calculator

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