in mei lins school, her science teacher gives tests that are marked out of 100. mei lin has an average of 60 marks on her first four science tests. on the fifth test she got 80 marks. what is the average of mei lins marks in science after all five tests?

64

Step-by-step explanation:

Lets take mei lin's first four test scores to be 60 since it average out to be 60.

After the 5th test,

mei lin new average score is

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation:

hello! just here for points! though i wish i knew!