A fruit seller had some mangoes. He sells 30% mangoes and still has 280 mangoes. Find the number of mangoes he had?

Answer: 400 mangoes
Explanation

The number of mangoes he has left is x - 0.30x = 0.70x (since 100% - 30% = 70%).

We know that the number of mangoes he has left is 280. So, we can set up the equation:

0.70x = 280

To solve for x, we can divide both sides by 0.70:

x = 280 / 0.70

x = 400

So, the fruit seller had 400 mangoes initially.

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