document.write( "Question 767663: Mary Beth's age is 3 times the age of her sister Ellen. Ellen is now 4 years old. How old will they both be whe Mary Beth is only twice the age of Ellen? \n" ); document.write( "

Algebra.Com's Answer #467756 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let $\"+m+\"$ = Mary Beth's age now
\n" ); document.write( "Let $\"+e+\"$ = Ellen's age now
\n" ); document.write( " $\"+e+=+4+\"$
\n" ); document.write( " $\"+m+=+3e+\"$
\n" ); document.write( " $\"+m+=+12+\"$
\n" ); document.write( "------------
\n" ); document.write( "Let $\"+n+\"$ = number of years from now when
\n" ); document.write( "Mary Beth is twice Ellen's age
\n" ); document.write( " $\"+m+%2B+n+=+2%2A%28+e+%2B+n+%29+\"$
\n" ); document.write( " $\"+12+%2B+n+=+2%2A%28+4+%2B+n+%29+\"$
\n" ); document.write( " $\"+12+%2B+n+=+8+%2B+2n+\"$
\n" ); document.write( " $\"+n+=+12+-+8+\"$
\n" ); document.write( " $\"+n+=+4+\"$
\n" ); document.write( "In 4 years, Mary Beth will be twice Ellen's age
\n" ); document.write( "check:
\n" ); document.write( " $\"+12+%2B+4+=+16+\"$
\n" ); document.write( " $\"+4+%2B+4+=+8+\"$
\n" ); document.write( "16 is twice 8
\n" ); document.write( "OK \n" ); document.write( "

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