radha could not solve 1/9th question of an exercise in mathematics,1/10th of the problems solved by her were wrong. If there were 90 questions in the exercise .how many problems did she answere correctly?
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Step-by-step explanation:
can't solve = 1/9 * 90 = 10
solved =90 -10 = 80
solved wrong = 1/10 * 80 = 8
problems she answered correctly
= 80 - 8 = 72 Answer
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