How many years old will Fred be y years from now?
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Please assist with above problem.
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How many years old will Fred be y years from now? (1) Doris
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alanforde800Maximus
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Statements combined:alanforde800Maximus wrote:How many years old will Fred be y years from now?
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
(1) Doris is 12 years older than Fred.
(2) The sum of the ages of Doris and Fred is y years.
Case 1: F=1
Since D is 12 years older, D = 1+12 = 13.
Since D+F = y, y = 13+1 = 14.
How many years old will Fred be y years from now?
14 years from now Fred will be 15.
Case 2: F=2
Since D is 12 years older, D = 2+12 = 14.
Since D+F = y, y = 14+2 = 16.
How many years old will Fred be y years from now?
16 years from now Fred will be 18.
Since the answer to the question stem can be different values, the two statements combined are INSUFFICIENT.
The correct answer is E.
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I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
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This DS question appears to be a derivation of this PS question: https://www.beatthegmat.com/stuck-t286350.html
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