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

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Status: No dream is too large, no dreamer is too small
Joined: 14 Jul 2010
Posts: 532
In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 04:45
Top Contributor
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Difficulty:

35% (medium)

Question Stats:

71% (02:07) correct 29% (01:58) wrong based on 24 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: 189
Location: India
Concentration: General Management, Operations
Schools: Tuck '19
In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 05:22
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

Press Kudos if it helps!!
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Joined: 22 Feb 2018
Posts: 393
Re: In three years, Skippy's dad will be four times as old as Skippy was  [#permalink]

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30 Oct 2018, 05:30
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 &nbs [#permalink] 30 Oct 2018, 05:30
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