Question
PSLE
There are 21 puffs in a box. 15 of them are mango puffs while the rest are vanilla ones. What is the ratio of the number of total puffs to that of vanilla puffs in the box?
1 m

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PSLE
There are 21 puffs in a box. 15 of them are mango puffs while the rest are vanilla ones. What is the ratio of the number of total puffs to that of vanilla puffs in the box?