英语翻译4/12/638.990.6517,546.198378.6244.543用英语说这些数字.请用英语翻译下面句子

英语翻译
4/1
2/6
38.99
0.65
17,546.198
378.624
4.543
用英语说这些数字.
请用英语翻译下面句子：
1.Shakuntala Devi is from India.
2.Shakuntala's brain took fifty seconds to find answer.
3.A group of students must decide what three things they should buy.
4.Add 5 and 4,and you can get nine.
5.Subtract 7 from 4,and you can get seven.
6.Multiply 2 by 3,and you can get six.
7.Divide 15 by 3,and you can get five.