A man brought a certain number of oranges out of which 13% were rotten. He gave 75% of the remaining in charity and still has 522 oranges left. Find how many had he brought?
Let’s assume the man has brought 'x' oranges
then,
Rotten orange 
therefore,
remaining apple = x – 0.13x = 0.87x
He gave 75% of remaining in the charity so,
= 0.87x × 0.75
= 0.6525x
This is the remaining orange to the left of the person so
In the question remaining orange is 522
Total oranges are 800.
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