book Maths Puzzle Numerical Ability

Solve inequality for x
x-2 * 3(x-8)<0

* = multiplication

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book Other Question

I need to know how to find 68% of 50 Is there any way you can give me the formula or a way to find the % of whole numbers like that? The equation C=5(F-32)/9 gives the relation between Fahrenheit and Celsius temperatures. Find the temperature at which the reading is the same on both thermometers.