What is the measure for angle Y?
Hello,

Adding member by member, we have

if n=100 sum
B=9
Explanation:
Multiply everything by 3 to get rid of the fraction. The new equation is 2b +15 = 60 -3b. Next, add three b to 2b and subtract 15 from 60. New equation is 5b = 45. Divide both sides by 5. B = 9.