Question
PSLE
Fred had tarts and Archie had muffins. Both gave half of what they had to each other. Fred sold 9 tarts and Archie sold 30 muffins. In the end, the ratios of tarts to muffins for Fred and Archie were 1 : 4 and 1 : 2 respectively. How many tarts did Fred have at first?
4 m

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PSLE
Fred had tarts and Archie had muffins. Both gave half of what they had to each other. Fred sold 9 tarts and Archie sold 30 muffins. In the end, the ratios of tarts to muffins for Fred and Archie were 1 : 4 and 1 : 2 respectively. How many tarts did Fred have at first?