document.write( "Question 1051147: At present, Bob is twice as old as Alice. In 20 years time, the ratio of Alice to Bob’s age will be 9:13. How old is Alice now \n" ); document.write( "

Algebra.Com's Answer #666762 by Fombitz(32388) $\"\"$ $\"About$

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$\"B=2%2AA\"$
\n" ); document.write( "and
\n" ); document.write( " $\"%28A%2B20%29%2F%28B%2B20%29=9%2F13\"$
\n" ); document.write( " $\"9%28B%2B20%29=13%28A%2B20%29\"$
\n" ); document.write( " $\"9B%2B180=13A%2B260\"$
\n" ); document.write( " $\"9B-13A=80\"$
\n" ); document.write( "Substituting,
\n" ); document.write( " $\"9%282A%29-13A=80\"$
\n" ); document.write( " $\"18A-13A=80\"$
\n" ); document.write( " $\"5A=80\"$
\n" ); document.write( " $\"A=16\"$
\n" ); document.write( "Then,
\n" ); document.write( " $\"B=2%2A16\"$
\n" ); document.write( " $\"B=32\"$
\n" ); document.write( " \n" ); document.write( "

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