The option that is not equal to the rest is option D - 6 of 50%.
"Equal ratios" means that the ratios can be simplified to the same fraction or decimal.
Let's simplify the ratios in each option:
A) 2/15 can be simplified to 4/30, which is equal to 2/15.
B) 3/2 can be converted to 1.5. 1.5 multiplied by 400 equals 600, so this ratio is equivalent to 600/400, which simplifies to 3/2.
C) 5/60 can be simplified to 1/12.
D) 6 of 50% can be written as 6/0.5. When simplified, this ratio is equal to 12.
Therefore, options A, B, and C have equal ratios, and option D is not equal to the rest.