the national flag of france has a width to leghth ratio of 2:3 what is the width of an 18 inch long french flag

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You should set up a proportion.  2:3 = ?:18You could then re-write your ratios as fractions.  Write 2 over 3 = ? over 18.  Now, you have two equivalent fractions.  You can solve using cross multiplication.  Multiply 18 times 2, then divide that answer by 3.  That will be your answer/ the width of the flag.