There are red, blue and yellow-coloured balls in a box. Half of the balls are red. There are 12 blue balls and three times as many yellow balls as blue balls. How many balis are there altogether?

This is my math question, could you help me

please help me solve this math question. i have attached a file containing the question.

Ray scored 75 marks for his first math test. His math score increased by 20% on his second math test. However, for his third math test, his math score decreased by 20%. What was his math score for his third math test?