How can I figure out my grade from 3 tests and 3 quizzes?

My chemistry teacher told me my grade was 68.8% a few weeks ago, and I've done another quiz and a test since then. I'm not overly strong in math (and apparently lacking in chemistry skills too), so can someone tell me how to figure out my approximate grade if tests are worth 20% each, and quizzes are 5% each. I've written 3 tests and 3 quizzes so far, we still have a test and quiz left, and 1 test rewrite at the end of the semester. My marks are as follows (don't laugh): test 1.) 26/42 test 2.) 28/43 test 3.) 54/72 quiz 1.)54/55 quiz 2.) 40/50 quiz 3.) 32/36

As you can see, I don't test well...quizzes I'm good with though! Thanx for any help... =)

How can I figure out my grade from 3 tests and 3 quizzes?

well if u average out the three test grades u get 67.33333333333 (repeating). when u average out the quizzes u get an average of 89. but since the tests are worth much more, each quiz would average out the test just by 5 %. so when u look at the fact that quizzes are 1/4 of the value of tests, ur average goes from 67.3333 up about 4.45 points to about a 72 a think.

How can I figure out my grade from 3 tests and 3 quizzes?

add your scores, divide by 6