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The sum of Emil’s and Rosa’s ages is 27 years. Nine years ago Emil was twice as old as Rosa was then. How old is each person?
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The sum of Emil’s and Rosa’s ages is 27 years. Nine years ago Emil was twice as old as Rosa was then. How old is each person?
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Nov 26, 2019
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The sum of Emil’s and Rosa’s ages is 27 years. Nine years ago Emil was twice as old
as Rosa was then. How old is each person?
Mathematics
middle-school
J David Smith
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J David Smith
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e + r = 27;
e - 9 = 2 x ( r - 9 );
So, e = 27 - r;
Then, 27 -r - 9 = 2r - 18;
18 - r = 2r - 18;
18 + 18 = 2r + r;
36 = 3r
Finally, r = 12 years (Rosa);
e = 27 - 12;
e = 15 years (Emil);
Vivek Soneja
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Dec 1, 2019
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Vivek Soneja
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