Answer:
i dont really know
Step-by-step explanation:
since you haven't posted a question, I don't really know what to answer. But, I'll try to give a sense of the answer.
Since there are two seeds every 6 in, you can find that there is 1 seed per
3 in. so, if your question is something like, 'how many inches if there are 13 seeds?', then you can just multiply 13 by 3, and 39 inches per 13 seeds.
you can also use the simple and amazing logic of ratios to solve the problem. since it is 3 inches every seed, you can write the ratio as 3:1, and if 3 or 1 gets multiplied, then the other number has to get multiplied by the same number.
Sorry if I overexplained.