C. If (2x - 1): (3x + 1) is the duplicate ratio of 3:4, then find value of x and the sub-duplicate ratio of (4x + 5): (7x + 1) after putting value of x.
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Answer:
2x-1/3x+1=3/4
8x-4=9x+3
8x-9x=3-4
-x=1
x=1
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