That is false... coefficients in polynomials can lead in either positive or negative
60 = 0.20x
60/0.20 = x
300 = x <== so 60 minutes is 20% of 300 minutes
When two adjacent angles form a straight line, they are called linear pair. They add up to 180.
j + 102 = 180
j = 180 - 102
j = 78
