There are 10 baskets numbered from 1 to 10 and filled with apples. 10 children are asked to pick apples one by one from each basket such that the number of apples picked by each child from each basket is equal to the number marked on the basket. If there were 1000 apples in total and the baskets were filled in such a way that none of the basket became empty in the process, how many apples were left in the end?  Select: A) 330 B) 390 C) 450 D) 510 E) 570
Each child takes a total of 1+2+3+4+5+6+7+8+9+10 = 10*11/2= 
<gadget id="calculator">10*11/2</gadget>
<output>55</output>
55 apples.   The total number of apples taken by 10 children is  10*55= 
<gadget id="calculator"> 10*55</gadget>
<output>550</output>
550   The number of apples left in the end is  1000 - 550= 
<gadget id="calculator"> 1000 - 550</gadget>
<output>450</output>
450 apples.   The answer is 450.
<result>C</result>
There are 10 baskets numbered from 1 to 10 and filled with apples. 10 children are asked to pick apples one by one from each basket such that the number of apples picked by each child from each basket is equal to the number marked on the basket. If there were 1000 apples in total and the baskets were filled in such a way that none of the basket became empty in the process, how many apples were left in the end?