A fruit seller had some mangoes. He sells 30% mangoes and still has 280 mangoes. Find the number of mangoes he had.  Choose the correct option
A) 228 mangoes
B) 400 mangoes
C) 287 mangoes
D) 408 mangoes
E) 289 mangoes
Explanation:   Suppose originally he had X mangoes.   Then, (100 – 30)% of X = 280   70/100 * X = 280   X = (280 * 100) / 70= 
<gadget id="calculator">(280 * 100) / 70</gadget>
<output>400</output>
400   ANSWER: 400 mangoes
<result>B</result>
A fruit seller had some mangoes. He sells 30% mangoes and still has 280 mangoes. Find the number of mangoes he had.