Log problem Answer

Z gave her share of money. So, totally, 24 kopecks were needed to cook. 24/8=3 kopecks per log.
Y's 5 logs costs 15 kopecks. His share of 8 will be deducted and will be given 7 kopecks.
X put 3 logs, total investment is 9 kopecks. X will get 1 kopeck back.

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