Riddles and Answers

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Math

I am as simple as a circle, worthless as a leader; but when I follow a group, their strength increases tenfold. By myself I'm practically nothing. What am I?

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Math

How can you give someone $83 using exactly 7 bills, without using any one dollar bills?

Math

Where can you place one line to make the following true, 5+5+5=550?