Please solve this question: The ratio of boys to girls in Mr.Peter class is 3:4. On the last exam, 3

Please solve this question:
The ratio of boys to girls in Mr.Peter class is 3:4. On the last exam, 3/4 of the boys passed the exam and 4/5 of the girls passed. If a students exam paper is chosen at random, what is the probability that it has a passing grade?
also
How to do it on TI-84
Thanks

 

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