Question
A student’s average score in 8 tests is 56 marks. After the 9th test, his average becomes 58 marks. How many marks did he score in the 9th test?
Solution
Total marks in first 8 tests = 8 × 56 = 448. New average after 9 tests = 58. Total marks after 9 tests = 9 × 58 = 522. Marks in 9th test = 522 − 448 = 74. Answer: He scored 74 marks in the 9th test.
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