If half of a number is 30,then three-quarters of that number is __数学解答

If half of a number is 30,then three-quarters of that number is _______.
为什么是45?

人气：396 ℃　时间：2019-10-02 21:27:44

解答

45
一个数的一半是30
那它的四分之三是多少
就是45啊