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Set up the problem as: y=number of yellow marbles & 4y=number of blue marbles. 40=y+4y or 40=5y or y=8. Therefore number of blue marbles is 4*8 = 32.
48 marbles
at least 39 blue marbles
12 blue marbles
102/6=17*5=85 Harry=85 marbles. Jack=17 marbles.