Question

Monu solved 25 questions of his math assignment. This was 1/8 of total questions He does not know 1/5 of the rest. How many question were there in all. How many did not know

Answer 1

25 = x/8

so, 200 questions

not sure what "the rest" is, if he answered 1/8 of all the questions.
Maybe you can figure it out from this.