exam Maths Puzzle Numerical Ability

The length of the shadow of a flagpole was found to be 72 feet. The shadow of a 3 foot pole picket fence in line with the flagpole was 4 feet. What is the height of the flagpole?

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I am having a hard time understanding constants. Here is my problem: Determine the constant k so that the graph of 3x+(k-1)y=k+1 will have slope 5.

Thank you. Show that 0.00315 (line of the 15) is a rational number by writing it as a fraction of integers.