book Maths Puzzle Numerical Ability

WHAT IS NANOGRAM

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hi my name is darrien I am in the 7th grade and I need a example of how to work out this problem.5:1=30:x or x:21=2:3= The lenghth of a rectanguler room is 5 feet more than 3 times the width.Find the dimensions if the perimeter is 62 feet?