ANSWER
8 : 3
Step-by-step explanation
We have that the jar contains 990 beans, 8/11 of which are kidney beans.
The number of kidney beans are:
8 / 11 * 990 = 720
We can find the number of navy beans by subtracting the number of kidney beans from the total number of beans:
990 - 720 = 270
Therefore, the ratio of kidney beans to navy beans is:
720 : 270
In lowest terms:
8 : 3
That is the answer.