**Adam’s average homework score, worth 40% of his grade, is 76%.**

**His average unit test score, worth another 40%, was 81%. The**

**final makes up the rest of his total grade. What is the minimum**

**number of questions he need to answer correctly on the 50-question**

**final exam to earn a B (80%) in the class?**

**Answer:**

76×0.4+81×0.4=62.8

79.5−62.8=16.7

16.7÷20=0.835

0.835×50=41.75

Round 41.75 up to 42.

42 questions is the minimum number of questions he needs to get right in order to earn an 80 in the class