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 picket fence in line with the flagpole was 4 feet. What is the height of the flagpole?

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exam Other Question
How can you find the slope-intercept form of the line perpendicular to y=-3x, passing through the point (o,-3)? Please help me with this problem

SOlve by substitution:

b = -2c + 4
2c + b = 4