十五用英语说是fifteen。
15英文：fifteen读【ˌfɪfˈtiːn】，复数：fifteens，adj、十五的。
例句
1、商谈迟了约十五分钟才开始。
The talks began some fifteen minutes late.
2、那时候，大多数人上学只上到十五岁。
In those days most people left school when they were only fifteen years old.
3、我们历经十五年的时间还清了抵押借款。
We paid off our mortgage after fifteen years.
4、你家里的电线应该每十到十五年更新一次。
The wiring in your house should be renewed every ten to fifteen years.
5、三个五等于十五。
Three fives are fifteen.
6、公司在最兴隆时期每隔十五分钟就开出一列火车。
In its heyday,the company ran trains every fifteen minutes.
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