Question
PSLE
Mark had shortbreads and Tom had muffins. Both gave half of what they had to each other. Mark sold 12 shortbreads and Tom sold 20 muffins. In the end, the ratios of shortbreads to muffins for Mark and Tom were 1 : 5 and 1 : 3 respectively. How many shortbreads did Mark have at first?
4 m

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PSLE
Mark had shortbreads and Tom had muffins. Both gave half of what they had to each other. Mark sold 12 shortbreads and Tom sold 20 muffins. In the end, the ratios of shortbreads to muffins for Mark and Tom were 1 : 5 and 1 : 3 respectively. How many shortbreads did Mark have at first?