What a Math

If 21x = 79x, what is the value of x?




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We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

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The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

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