the students of three classes p. q and r take a test. the average mark per student of p and q put together is 60. the average marks per student of q and r put together is 64. the average mark per student of p and r put together is 72. if the average mark per student of all the classes put together is x , then what is the value of x?
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196
Step-by-step explanation:
x=60+64+72
x=124+72
x=196
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