SOLUTION: Please help with this type of question that does not give the total number of children. . . A Teacher gives 2 tests to her class. 30% of the class passed both tests and 45% of

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Please help with this type of question that does not give the total number of children. . . A Teacher gives 2 tests to her class. 30% of the class passed both tests and 45% of       Log On


   

Question 442391: Please help with this type of question that does not give the total number of children. . .
A Teacher gives 2 tests to her class. 30% of the class passed both tests and 45% of the class passed the first test. What percent of those who passed the first test also passed the second tes
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
this is pretty tough to interpret.
The way I read it is that 45% of the class passed
the 1st test, and some of that 45% also passed the 2nd test.
The 30% that passed both tests is included within the 45% that
passed the 1st test.
So the problem is asking "30 is what percent of 45?"
+x%2F100+=+30%2F45+
+x+%2F100+=+2%2F3+
+3x+=+200+
+x+=+66.67+
66.67% of those who passed 1st test also passed 2nd test
Some one else might read this differently.
I'd get another opinion, too.