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# Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s

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Math Expert
Joined: 02 Sep 2009
Posts: 53061
Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s  [#permalink]

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21 Jan 2019, 00:23
00:00

Difficulty:

35% (medium)

Question Stats:

50% (01:26) correct 50% (01:25) wrong based on 12 sessions

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Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s age. How old will Bob be in 5 years?

A 8
B 18
C 22
D 23
E 27

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Director
Joined: 18 Jul 2018
Posts: 675
Location: India
Concentration: Finance, Marketing
WE: Engineering (Energy and Utilities)
Re: Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s  [#permalink]

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21 Jan 2019, 00:29
B = 10+J
B+2 = 2(J+2)
12+J = 2J+4
J = 8
B = 18
In 5 years Bob will be 23 years old.

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Re: Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s  [#permalink]

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21 Jan 2019, 08:06
Bunuel wrote:
Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s age. How old will Bob be in 5 years?

A 8
B 18
C 22
D 23
E 27

b=j+10
b+2=(j+2)*2
b+2=2j+4
b=2J+2
J+10=2J+2
J=8
B= 8+10 = 18
5 years later 18+5 = 23
IMO D
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Re: Bob is 10 years older than Jack. In 2 years, Bob will be double Jack’s   [#permalink] 21 Jan 2019, 08:06
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