document.write( "Question 885963: A can EAT pizza in 10 min
\n" ); document.write( "B can eat pizza in 15 min
\n" ); document.write( "Their grandfather can eat a pizza in 30 min\r
\n" ); document.write( "\n" ); document.write( "If, A, B & their grandfather all start eating the same pizza at the same time, how many seconds does it take them to finish the pizza?\r
\n" ); document.write( "\n" ); document.write( "240 sec
\n" ); document.write( "360 sec
\n" ); document.write( "300 sec
\n" ); document.write( "330 sec
\n" ); document.write( "

Algebra.Com's Answer #535586 by basketball1127(19)\"\" \"About 
You can put this solution on YOUR website!
Let x= 1 whole pizza\r
\n" ); document.write( "\n" ); document.write( "A can eat x/10 of the pizza in 1 min
\n" ); document.write( "B can eat x/15 of the pizza in 1 min
\n" ); document.write( "Their grandfather can eat x/30 of the pizza in 1 min \r
\n" ); document.write( "\n" ); document.write( "\"x%2F10%2Bx%2F15%2Bx%2F30=1+min\"
\n" ); document.write( "\"%283x%2B2x%2B1x%29%2F30=1+min\"
\n" ); document.write( "\"6x%2F30=1+min\"
\n" ); document.write( "\"x%2F5=1+min\"
\n" ); document.write( "\"x=5+mins\"\r
\n" ); document.write( "\n" ); document.write( "x=300 seconds
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