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In order to keep the ship safe, you need to think ahead of the enemy. They have sent you a number, added 0.5 to that number and then multiplied the new result by 4. They then subtract 2 and divide the number by 2. The final answer is 48. What number did they send you?

Fact Lab

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Interesting fact:

In the interest of advancing their own technology, CIA once “kidnapped” a Soviet spacecraft overnight, took it apart, took notes about it, reassembled it, and sent it back without the Soviets realizing.