book Maths Puzzle Numerical Ability

find the unit rate

3 tablespoons for 1.5 servings

$10.99 for 12 slices of pizza

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book Other Question

425/604=425*100/604=70.36% and 230/344=230*100/344=66.86%
when compared 70.36%>66.86%

is there a way to increase the validity of my findings?
Solve the following rational equation:

2x-1 over 2x + 10 over 12 = x-6 over 3x.