document.write( "Question 1191871: A student missed 13 problems on a Physics test and received a grade of 48%. If all the problems were of equal value, how many problems were on the test? Round off your answer to the nearest integer. \n" ); document.write( "

Algebra.Com's Answer #823721 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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A student missed 13 problems on a Physics test and received a grade of 48%.
\n" ); document.write( " If all the problems were of equal value, how many problems were on the test?
\n" ); document.write( " Round off your answer to the nearest integer.
\n" ); document.write( ":
\n" ); document.write( "let n = number of problems on the test
\n" ); document.write( " $\"%28n-13%29%2Fn\"$ * 100 = 48
\n" ); document.write( " $\"%28n-13%29%2Fn\"$ = $\"48%2F100\"$
\n" ); document.write( "cross multiply
\n" ); document.write( "100(n-13) = 48n
\n" ); document.write( "100n - 1300 = 48n
\n" ); document.write( "100n - 48n = 1300
\n" ); document.write( "52n = 1300
\n" ); document.write( "n = 1300/52
\n" ); document.write( "n = 25 problems on the test
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "Check (he got 12 right)
\n" ); document.write( "12/25 * 100 = 48
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