Solve these:

15. In an examination a candidate secured 125 marks and failed by 15 marks. If the pass percentage was 35%; find the maximum marks.

16.In an objective type paper of 150 questions, John got 80% correct answers and mohan got 64% correct answers.
(i)  How many correct answers did each get?
(iii) What percent is Mohan's correct answers to John's correct answers?

17. The number 8,000 is first increased by 20% and then decrease by 20%. Find the resulting number. 

Kindly refer the similar link for your query.
 15) https://www.meritnation.com/ask-answer/question/in-an-examination-a-candidate-has-to-secure-40-marks-to-pa/percentages/5384795
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