exam Maths Puzzle Numerical Ability

Thanks for you assistance in the past. I need some help with the below equation.

Find the solutions to the equation: x - 5/x = 4

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exam Other Question

My book asks me to round a decimal (such as .6730) to the nearest minute. What is a minute and how do I convert this? How many pounds of hamburger that costs $1.10 per pound must be mixed with 50 pounds of hamburger that costs $1.80 per pound to make a mixture that costs $1.30 per pound?