3:7ratio of blue and red chairs if there are 91 red chairs how many blue are there?

There are 39 blue chairs.

You can find this by setting up a proportional equation:

3/7 = x/91

Solve for x by cross-multiplying:

7x = 91*3

7x = 273

7x / 7 = 273 / 7

x = 39

So, there are 39 blue chairs if there are 91 red chairs.