Others Maths Puzzle

Q. Find ?.
83^27.3/83^1.4*83^46.8=83^31.9+?

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Others Other Question

Q. The cost of 4 CD(s) is 4 more than the cost of a DVD. The cost of 1 CD(s) and a DVD is 10. What is the cost of a DVD? Q. In a 100m race, if A gives B a start of 20m then A wins the race by 5 sec. If A gives B a start of 40m the race ends in a dead heat. How long does A takes to run 200m?