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The expression 2b - c represents the result of subtracting the value of c from twice the value of b. This can also be written as 2 multiplied by the variable b, then subtracting the value of c. The result will depend on the specific values of b and c.
The simplest way: Ratio a : b equals ratio c : d if (and only if) a*d = b*c
a*b*c
The ratio of (a/b) and (c/d) is (a/b)/(c/d) = (a/b)*(d/c) = ad/bc So, the method is to multiply the first fraction by the reciprocal of the second.
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