We notice that the upper trapezoid is symmetric to the lower one & the line of symmetry should be a horizontal line (mirror line) where any point of the upper vertices should be at equal distance (perpendicular) with the related vertices of the lower one from this horizontal line: Note that QQ" =4 units, Hence the line of symmetry is the perpendicular to QQ' at 2 units
Of 85% of cars sold where not black then 100-85% where black = 15% let the number of cars sold be y then 15%*y=300 y= 300 divided by 15% = (300*100)/15 =2000 therefore 2000 cars were sold