英语翻译of every 30 telephone calls that colin makes,7 are STD c
英语翻译
of every 30 telephone calls that colin makes,7 are STD calls.if he made 360 calls,how many of them were STD calls?
of every 30 telephone calls that colin makes,7 are STD calls.if he made 360 calls,how many of them were STD calls?
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