The following Bar diagram shows the population of Mumbai and Delhi (in thousands) in a certain year. Numbers within brackets denote the percentage of males in the given population. Mumbai : 12,500 (55%) Delhi : 8,400 (54%) If 90% of males in Mumbai are literate and if 80% of females in Delhi are literate, then the ratio of the number of illiterate males in Mumbai to the number of illiterate females in Delhi is closest to: