A man left a sum of money to his 4 children. Bert received 50% of Cyril's amount. Alan received as much as Bert and John together. Cyril received 125% of John's amount. John received 840 pounds. How many pounds more did Alan receive than Cyril?
Each line and symbol in the four outer circles is transferred to the centre circle according to these rules. If it occurs in the outer circles: once - it is transferred; twice - it is possibly transferred; 3 times - it is transferred; 4 times - it is not transferred. Which of the circles A, B, C, D or E should appear at the centre?