exam Maths Puzzle Numerical Ability

The gravitational force between two objects varies inversely as the square of the distance between the objects. If a force of 25 pounds results from two objects that are 6 miles apart, how much force results from two objects that are 15 miles apart?

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am trying to help my 9th grader with algebra....the problem is: 8=x/5 If a piece of real estate purchased for $75,000 in 1998 appreciates at the rate of 6% per year, then its value t years after the purchase will be f(f)=75,000(1.06^t). According to