The english department orders 7800 textbooks for the year. How many textbooks is this per term? (a term is three months)

So how many terms in a year ?
Then simply divide the number of books by the number of terms.

A man spent 1/3 and 300 from what he had found that he had still left with Rs. 400 and 3/8 of what he had at the beginning. How much had he spent ? Please solve it step by step without using any unknown “x”.

Its answer is Rs.1100.