Passage V

The higher a gasoline's octane number (ON), the more smoothly the gasoline burns, lessening engine damage. Sulfur (S), naturally present in gasoline, damages exhaust systems in cars. Table 1 gives the ON and S content of 6 gasolines (Fuels A-F).

Figures 1 and 2 show the decrease in ON resulting from using Methods 1 and 2, respectively, to reduce a gasoline's S content from a given initial value to a given final value. Consider a gasoline having an ON of 90.00 and an S content of 100 ppm. If Method 1 is used to reduce the S content to 25 ppm, Point A in Figure 1 shows that the decrease in ON will be 0.35, so the ON will decrease to 89. 65 (because 90.00 - 0.35 = 89.65).

24. Consider 3 gasolines having S contents of 50 ppm, 75 ppm, and 100 ppm, respectively. According to Figure 1, if Method 1 is used to decrease each fuel's S content to 15 ppm, the decrease in ON for each fuel is best shown by which of the following graphs?

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

Look at figure 1, when the abscissa final S content is 15ppm, the vertical coordinates corresponding to the three curves of 50 ppm, 75 ppm, and 100 ppm are decomposed into 0.35, 0.45, and 0.6, so it is the G option