SOLUTION: 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 t

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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.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
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.
:
let n = number of problems on the test
%28n-13%29%2Fn * 100 = 48
%28n-13%29%2Fn = 48%2F100
cross multiply
100(n-13) = 48n
100n - 1300 = 48n
100n - 48n = 1300
52n = 1300
n = 1300/52
n = 25 problems on the test
:
:
Check (he got 12 right)
12/25 * 100 = 48