Abraham’s mathematics exam had 30 algebra questions and 50 geometry ques- tions, each worth 1 mark. He got 70% of the algebra questions correct, and
his overall exam mark was 80%. How many geometry questions did he answer correctly?
70% of 30 = 0.7*30 = 21
30 + 50 = 80
80% of 80 = 0.8*80 = 64
64 - 21 = 43
+8 
