Question
PSLE
Sam had wafers and Sean had cookies. Both gave half of what they had to each other. Sam sold 11 wafers and Sean sold 31 cookies. In the end, the ratios of wafers to cookies for Sam and Sean were 1 : 7 and 1 : 5 respectively. How many wafers did Sam have at first?
4 m

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PSLE
Sam had wafers and Sean had cookies. Both gave half of what they had to each other. Sam sold 11 wafers and Sean sold 31 cookies. In the end, the ratios of wafers to cookies for Sam and Sean were 1 : 7 and 1 : 5 respectively. How many wafers did Sam have at first?