The Percentage Machine
If you have a factory, in that factory, you have a machine, the machine does 2 steps before giving the output, it adds 50% of the number you put in to the original number, then, it removes 50% of the number you got after the first step.
What number would you get if you put 10 in the machine?
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1 solution
Let the number we input be n.
Output
= n x (100% + 50%) x (100% - 50%)
= n x [(150%) x (50%)]
= n x (75%)
Answer
= 10 x 75%
= 7.5