exam Maths Puzzle Numerical Ability

The length of a rectangle is 2in. more than twice it's width. If the perimeter of the rectangle is 52in., find the width of the rectangle.

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Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

Thanks What is the best way to explain to a parent the difference between .600 and .00006 ? I'm thinking that if I show these decimals as fractions it might seem clearer to them.