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Answer 1 · 2018-01-04T16:29:14

Set up a proportion.

So the ratio is #5:9# (blue:red) and it is asking you how many blue flags there are for #1800# red flags #(x:1800)#

Here #x# would be the number of blue flags.

You can solve this by seeing that #1800# divided by #9# is #200#, and then multiply #200# by #5# (so there would be #1000# blue flags)

Or you can set up an equation as

#5/9=x/1800#

You can then cross multiply

#9x=9000#

#x=1000#

So #1000# blue flags.