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Answer:
34 each group
Step-by-step explanation:
let "x" be the number of Marble in each group
385 = 11x + 11
-11
374 = 11x
374 / 11 = 34
34 = x
You can check your answer to see if it is correct by solving it with x being "34"
385 = (11 * 34) + 11
11 * 34 = 374
385 = 374 + 11
385 = 385