1) You look for a common factor between the two numbers. Prime factorization can help here.
2) You divide both numbers by this factor.
Three goes into both 21 and 33.
21 to 33 can be simplified to 7 to 11.
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21/7 = 3 Or, a 3 to 1 ratio.
21:6::7:2
It is: 12 to 21
√33√21 = √(3x11)√(3x7) = √3√11√3√7 = (√3)^2√7√11 = 3√7√11 (or 3√77).
simplify the ratio 18b^2 to 45b