document.write( "Question 940714: If a boy saved P25 on the firat day, P27 on the second day, P29 on the third day and so on, how many days will it take to save P880? \n" ); document.write( "
Algebra.Com's Answer #573342 by krutarthas(22)\"\" \"About 
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If a boy saved P25 on the firat day, P27 on the second day, P29 on the third day and so on, how many days will it take to save P880?\r
\n" ); document.write( "\n" ); document.write( "letus take n days
\n" ); document.write( "P880 = P25 + P27 + P29 + .....\r
\n" ); document.write( "\n" ); document.write( "AS WE KNOW THIS IS AN ARITHMATIC PROGRESSION
\n" ); document.write( " Sn=n(2a1+(n-1)d)/2
\n" ); document.write( "HERE Sn=880, a1=25 d=2
\n" ); document.write( "⇒880=n(2x25+(n-1)2)/2
\n" ); document.write( "⇒880=25n-nē-n
\n" ); document.write( "⇒nē-24n-880=0
\n" ); document.write( "⇒nē-44n+20n-880=0
\n" ); document.write( "⇒n(n-44)+20(n-44)=0
\n" ); document.write( "⇒(n-44)(n+20)=0
\n" ); document.write( "⇒n=44 or,n= -20 which is impossible
\n" ); document.write( "⇒n=44
\n" ); document.write( "in 44 days it will take to save P880\r
\n" ); document.write( "\n" ); document.write( "answer
\n" ); document.write( "Krutartha\r
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