I have 20 cards numbered 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 - I have added these up to make 210 - I need to make 6 uneven piles using all the cards to make 35 in each pile - Card can only be used once. Many thanks for your help - can you also explain to me what I would need to do if I had a question like this again.