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circles

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a : b = 5 : 1 and b : c = 2 : 3, then a : c =?I really need help on both
1. 1 answer
2. 300 views
if 3a = 5b, what is a:b?
1. 2 answers
2. 327 views
what is the ratio of the circumference of circle to its radius?
1. 2 answers
2. 717 views