Question

Nadia surveyed 80 students at her school and found that 0.55 of the students she surveyed said their favorite class is math. Another 15% of the students she surveyed reported that their favorite class is science. How many more students in the survey prefer math over science?

Answer 1

80 x .55 = 44 people whose favorite class is math
80 x .15 = 12 people whose favorite class is science 
(15 as a decimal is written as .15)   

44 - 12 = 32 more students prefer math over science

Answer 2

80 (.55) = 44 students prefer math
80 (.15) = 12 students prefer science
44-12 = 32 more students prefer math than science