A test is worth a total of 150 points and contains 70 questions. Some of the questions are worth 2 points and some are worth 4 points.
The test has
questions worth 2 points and
questions worth 4 points.
Emma answered a certain number of questions correctly and scored 100 points. If she answered 46 questions worth 2 points correctly, the number of questions worth 4 points she answered correctly is
.