There are several cookies in the jar. Taking 1 cookie away would leave half as many in the jar as if 5 were added. How many cookies are in the jar?
Please answer and provide answer explanation.
7
Let C be the number of cookies.

There would be C - 1 cookies.

There would be (C + 5) / 2 cookies.

C - 1 = (C + 5) / 2.

2(C - 1) = C + 5.

2C - 2 = C + 5.

C = 7.

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The final answer: 7