TCS Company Numerical Ability Simple & Compound Interest

akshay scores 80% in physics and 66% in chemistry and the maximum marks of both the papers are 100.what percent does he score in maths which is of 200 marks,if he scores 80% marks in all the three subjects?

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TCS Other Question

a petri dish hosts a healthy colony of bacteria.once a minute every bacterium divides into two.the colony was founded by a single cell at noon.at exactly 12.43(43 minutes later) the petri dish was half full.at what time the dish will be full? in an examination 70% of the candidates passed in history and 50% in geography and 20% failed in both the subjects.if 500 students passed in both the subjects,then how many candidates appeared for the exam?