Question
PSLE
A bag contains marbles of three different colours. 15 of the marbles are blue. The ratio of the number of purple marbles to that of green marbles is 7 : 1. What is the ratio of the number of purple marbles to that of blue marbles?
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PSLE
A bag contains marbles of three different colours. 15 of the marbles are blue. The ratio of the number of purple marbles to that of green marbles is 7 : 1. What is the ratio of the number of purple marbles to that of blue marbles?