Quickly Solve the riddle

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?




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He collects a total of 324 coins.

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I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
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We have arranged an array of numbers below. What you have to do is use any kind of mathematical symbol you know excluding any symbol that contains a number like cube root. You can use any amount of symbols but you have to come up with a valid equation for all of them.

0 0 0 = 6
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What does this mathematical rebus means ?

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If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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Can you calculate the total time each of the insects took to change their positions?

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Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.