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i dont remember how do this type. What is the first step?

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Kathleen B. | Electrical Engineering Tutor (I can help with math too)Electrical Engineering Tutor (I can help...

You need to cross multiply to eliminate the fractions and solve for the variable r. 

11r*10 = 6*11, then multiply to get 110r = 66. 

Next multiply both sides by (1/110) to get r by itself.  So (1/110)*110r = 66*(1/110)

This step is normally not shown.  Multiplying both sides with the inverse of 110 is the same as multiplying the expression by 1. 

So  (1/110)*(110) becomes 1*r, and then r can be found. 

r = 66/110 =   0.6

Ben P. | Advanced Mathematics and Computer Science TutorAdvanced Mathematics and Computer Scienc...

Cross multiply to obtain    66=110r

Then divide 66 by 110 to isolate r and obtain r = 0.6