Book Maths Puzzle Age Problem

If Leah is 6 years older than her sister, Sue, and John is 5 years older than Leah, and the total of their ages is 41. Then how old is Sue?

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Book Other Question

find the slope and y-intercept of each line. graph the line.

-x+3y=6
In a college, some courses contribute more towards an overall GPA than other courses. For example, a science class is worth 4 points; History is worth 2 points; Math is worth 3 points; and English is worth 3 points. The values of the grade letters are as follows, A=4, B=3, C=2, D=1, F=0. What is the GPA of a student who made a "c" in Trigonometry, a "B" in American History, an "A" in Botany, and a "B" in Microbiology?