In an examination 80 student secured first class mark in English or mathematics out of thise 50 student obtained first class mark in mathematics and 10 in English and mathematics both how many students have secured first class mark in English only?

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.

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answer; authoritative;