1. In language school , 475/12 %of the students learn chinese ,125/4 % of the student learn German and the remaining 210 student learn Japanese .

What is the total number of student ?

Do you mean that 475 learn Chinese and that is 12% of the total student body?

Or do you mean 475/12% = 39.58% study Chinese?
If that is what you mean, then
125/4 % = 31.25%

Since Japanese is the only remaining language studied, then 29.17% study Japanese. This assumes that all students study only one language.

0.2917 N = 210. N = 720

To find the total number of students, you need to add the number of students learning Chinese, German, and Japanese.

First, let's calculate the number of students learning Chinese:
475/12 % of the students learn Chinese.
So, we need to find 475/12 % of the total number of students:
475/12 % = (475/12) / 100 = 475/1200

Now, let's calculate the number of students learning German:
125/4 % of the students learn German.
Similarly, we need to find 125/4 % of the total number of students:
125/4 % = (125/4) / 100 = 125/400

Finally, the remaining students learn Japanese, which is given as 210.

To find the total number of students, add the number of students learning Chinese, German, and Japanese:
Total number of students = Students learning Chinese + Students learning German + Students learning Japanese
Total number of students = 475/1200 + 125/400 + 210

You can simplify the fractions and add them to find the total number of students.