I have never seen an equation set up like this before. What do the colons represent? I'm sure it's a very simple equation and I'm stumped.

Hi Melissa;

This means...

500 is to x as 200 is to 1

It can be expressed as...

500 in the numerator is to x in the denominator, as 200 in the numerator is to 1 in the denominator...

500/x=200/1

Cross-multiply...

500=200x

2.5=x

OR...

500 in the numerator is to x in the numerator, as 200 in the denominator as 1 is in the denominator...

500/200=x/1

2.5=x

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