Think of a number. Add 17. Double the result.Subtract 4. Double the result. Add 20. Divide by 4. Subtract 20.What's your answer?

1 answer

Think of a number. = x
Add 17. =x+17
Double the result. = 2(x+17)
Subtract 4. = 2(x+17)-4
Double the result. = 2(2(x+17)-4)
Add 20.= 2(2(x+17)-4)+20
Divide by 4. = (2(2(x+17)-4)+20)/4
Subtract 20. = (2(2(x+17)-4)+20)/4 -20
Simplify the last expression and you will get your answer. It becomes a really simple expression.

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