doctor thinking

Dr. Johnson was doing some calculations for his work. He was supposed to multiply a certain number by 0.5 and then add 3 to the result. He got distracted and accidentally divided this number by 0.5 and subtracted 3 from the result. Surprisingly, he still got the right answer. What was the number that Dr. Johnson used in his calculations?

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Answer: 4.

Let X be the number that Dr. Jonson used in his calculations. Then, since he got right answer, we must have that 0.5X + 3 = 2X – 3. Solving for X, we get 4.

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