Q.If it took eight men ten hours to build a wall, how long would it take four men to build it?

LOL!!!!!.....Guest.....that answer is even better than mine ....!!!!!!

This is known as a "see-saw" problem

8 * 10 = 4 * x

80 = 4x divide both sides by 4

20 = x = the number of hours it takes 4 men

5HOURSπππππ©

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5HOURSπππππππππππππππ

No need. The wall's already built.