posted by Elizabeth .
Linda got a math test handed back to her and got a 96% on it. However she lost the test, not knowing what she got. If she knows that she scored a 43 on the test then how many 1- mark questions are there on the test?
Let N be the number of 1 mark questions.
43/N = 96/100
N = 100*43/96 = 44.79
Since N has to be an integer, so we need to round 44.79 to the nearest integer. In addition, as a check, divide 43 by N to make sure we get back 96%.