book Maths Puzzle Numerical Ability

The length of a rectangular building lot is twice its width. If the perimeter is 240 meters what are the dimensions of this building lot?

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book Other Question

"W-e Aaron,Brian and clyde- each have some children."

1. Aaron has at least one girl and twice as many boys as girls.
2. Brian has at least one girl and three times as many boy can you help me with this question? 5cubed-8times5+6