book Maths Puzzle Numerical Ability

how do you change a decimal to afraction and a fraction to a decimal?

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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? Describe to me the five steps that are used in solving linear systems by substitution?