Question
PSLE
There are 30 wafers in a box. 21 of them are matcha wafers while the rest are vanilla ones. What is the ratio of the number of vanilla wafers to that of matcha wafers in the box?
1 m

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PSLE
There are 30 wafers in a box. 21 of them are matcha wafers while the rest are vanilla ones. What is the ratio of the number of vanilla wafers to that of matcha wafers in the box?