On a math test, 60% of the students used a pencil. Half of the remaining students used a red pen. If 6 students used a rend pen, how many students are in the class?
60% used a pencil..that leaves 40% remaining students (100% - 60% = 40%) half of those used a red pen...so 20% used a red pen. (40% / 2 = 20%) 6 students used a red pen. so... 6 students is 20% of what number ? 6 = 0.20x 6/0.20 = x 30 = x There are 30 students in the class
