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Question
In 10 years, A will be twice as old as B was 10 years ago. If A is now 9 years older than B, then the present age of B is
19 years
29 years
39 years
49 years
ANSWER : 3
Descrption
<p style="margin-left:0px;"><br>Let B's present age = x years.</p><p style="margin-left:0px;">Then, A's present age = (x + 9) years</p><p style="margin-left:0px;">∴(x+9)+10=2(x−10)</p><p style="margin-left:0px;">⇔x+19=2x−20</p><p style="margin-left:0px;">⇔ x=39</p><p><br> </p>
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