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Old 09-29-2009   #1
sri340
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Default algebra inequality help

Ikeís age is three years more than twice his younger brotherís age. If the sum of their ages is at most 18, then find:

(a) the greatest age that Ikeís brother could be.

(b) an inequality that represents all possible values of Ikeís age (allowing for fractional years), given that his younger brother is at least 2 years old.
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Old 09-30-2009   #2
Mr. Hui


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Quote:
Ikeís age is three years more than twice his younger brotherís age. If the sum of their ages is at most 18, then find:
(a)
Let i = Ike's age
and
y = Younger brother's age.

i = 2y + 3

If the sum of their ages is at most 18 then:

y + 2y + 3 < 18

Solving the inequality:
y + 2y + 3 < 18
3y + 3 < 18
3y < 15
y < 5

Ike's brother is at most 5 years old.
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Old 03-06-2010   #3
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Ike's brother equals 5 year old. Well, To 5-6 Years, Old.
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