book Maths Puzzle Numerical Ability

how do youu solve a problem that only gives you the area and the ratio of the sides....and they ask you to find the perimeter

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It takes 16 days for Tom, the carpenter, to build a house. He started building the house and worked by himself for 7 days. Then another carpenter Jerry came to help Tom. They worke A board game for 2 to 6 players has a deck of cards that can always be divided evenly among all the players. What is the smallest numbers of cards that are possible?