document.write( "Question 257910: The sum of seven consecutive integers is 980. How many of them are prime? \n" ); document.write( "
Algebra.Com's Answer #189812 by checkley77(12844)\"\" \"About 
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LET X, X+1, X+2, X+3, X+4, X+5, X+6 BE THE 7 CONSECUTIVE INTEGERS.
\n" ); document.write( "X+X=1+X+2+X+3+X+4+X+5+X+6=980
\n" ); document.write( "7X+21=980
\n" ); document.write( "7X=980-21
\n" ); document.write( "7X=959
\n" ); document.write( "X=959/7
\n" ); document.write( "X=137 ANS. FOR THE FIRST INTEGER. PRIME
\n" ); document.write( "137+1=138 ANS.
\n" ); document.write( "137+2=139 ANS. PRIME.
\n" ); document.write( "137+3=140 ANS.
\n" ); document.write( "137+4=141 ANS.
\n" ); document.write( "137+5=142 ANS.
\n" ); document.write( "137+6=143 ANS.
\n" ); document.write( "PROOF:
\n" ); document.write( "137+138+139+140+141+142+143=980
\n" ); document.write( "980=980 \n" ); document.write( "
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