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Let u = marbles added to each box
Box A [u][ 128 ]
Box B [u]
Now after adding the u marbles to each box, Box A is twice of Box B, it means 2Box B = Box A
2(u+42) = u + 128
2u-u = 128 – 84
u = 44
Hence 44 marbles were added to each box.
Concept: Difference No Change
Video Solution can be viewed here