Question

SAT数学题目

一个长方体的地面积是21，另外，其中一个面的面积是30.
请问体积是多少？答案是220.求解。
1,The area of the base of the rectangular box is 21 and the area of one of the faces is 30.Each of the dimensions j,k,and l is an integer greater than 1.What is the volume of the rectangular box?（答案是220）

2，If n>1 and each of the three integers n,n+2,n+4 is a prime number,then the set of three such numbers is claaed a"prime triple"There are how many different prime triples?（答案是1）

Answer 1

1.明显是210，因为21和30只有公因数3，因为每条边整数所以一条边是3，所以长宽高为10,3,7，v=210
2.明显只有一组3,5,7，因为n,n+2，n+4中一定会有一个是3的倍数，而只有3是质数，所以只有1组。

Answer 2

用原英语写出来吧