Question

What must be added to - 4a/b which gives the sum of 2a/b?

Answer 1

6a/b

Let the unknown number be X.

(-4a/b) + X = (2a/b)

X = 2a/b - (-4a/b)

X = 2a/b + 4a/b

X = (2+4)a/b

X = 6a/b

From adjoining written solution you can understand better..

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