exam Maths Puzzle Numerical Ability

An airplane traveling at 450 mph enters a region with a headwind of 25 mph. How long will it take the plane to travel 950 miles into this wind?

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exam Other Question

Solve and check each of the following equations for x. more complicated and im thinking too much. thank you for helping me.

x/x-2 - x+1/x = 8/x^2-2x A culture of yeast doubles in size every 20 minutes. The size of the culture is now N0. Find its size in 12 hours.