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# In three years, Skippy's dad will be four times as old as Skippy was

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Senior Manager
Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 422
In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 05:45
Top Contributor
00:00

Difficulty:

25% (medium)

Question Stats:

79% (02:11) correct 21% (01:51) wrong based on 91 sessions

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In three years, Skippy's dad will be four times as old as Skippy was last year. Today, their ages add up to 48. How old is Skippy today?

a. 9

b. 10

c. 11

d. 12

e. 13

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Joined: 09 Jun 2014
Posts: 352
Location: India
Concentration: General Management, Operations
In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 06:22
Baten80 wrote:
In three years, Skippy's dad will be four times as old as Skippy was last year. Today, their ages add up to 48. How old is Skippy today?

a. 9

b. 10

c. 11

d. 12

e. 13

Let us assume the following

Skippy current age= X
Skip's Dad current age = Y

Now according to the question

In three years, Skippy's dad will be four times as old as Skippy was last year.
y+3= 4(x-1)
Today, their ages add up to 48
x+ y =11

So now we have two variables and two equations.

Solving them we get X=11

So option C

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Senior Manager
Joined: 22 Feb 2018
Posts: 420
Re: In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 06:30
1
OA:C

Let Skippy's age today be $$S$$
Let Skippy's dad age today be $$D$$

As per Question
$$D+3=4(S-1)$$

$$D=4S-7$$ ...(1)

$$D+S=48$$ ...(2)

Putting the value of $$D$$ from (1) into (2), we get

$$4S-7+S=48$$

$$5S-7=48$$

$$5S=55$$

$$S=11$$
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Re: In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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21 Apr 2019, 08:22
Baten80 wrote:
In three years, Skippy's dad will be four times as old as Skippy was last year. Today, their ages add up to 48. How old is Skippy today?

a. 9

b. 10

c. 11

d. 12

e. 13

dad age = x and skippy = y
given
x+3=4*(y-1)
and x+y=48
solve we get
48-y=4y-7
y=11
IMO C
Re: In three years, Skippy's dad will be four times as old as Skippy was   [#permalink] 21 Apr 2019, 08:22
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