book Maths Puzzle Numerical Ability

If the length of a living room is 15 feet, what will that length measure in inches on a blueprint whose scale is 1/6 inch to the foot?

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book Other Question

Marco has 150 coins, all nickels and dimes. He has 12 more dimes than nickels. How many nickels and how many dimes does he have? how do u find a formula for 2 sets of #s that shows how they r related?