document.write( "Question 271718: The first three digits of Sophie’s telephone number are 279. If 70 is added to Sophie’s age, this sum is 5939 less than three times the number formed by the last four digits of Sophie’s phone number. If Sophie is 30 years old, what is her telephone number? \n" ); document.write( "
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The first three digits of Sophie’s telephone number are 279. If 70 is added to Sophie’s age, this sum is 5939 less than three times the number formed by the last four digits of Sophie’s phone number. If Sophie is 30 years old, what is her telephone number?
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\n" ); document.write( "\n" ); document.write( "Let x be the last four digits of Sophie's phone number. Then\r
\n" ); document.write( "\n" ); document.write( "30 + 70 = 3*x - 5939
\n" ); document.write( "3x = 100 + 5939
\n" ); document.write( "3x = 6039
\n" ); document.write( "x = 2013\r
\n" ); document.write( "\n" ); document.write( "The number then is 279-2013.
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