book Maths Puzzle Numerical Ability

2 1/3{4/3-2/5(3/4+3/7)}

Can anyone help me solve this one.

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book Other Question

Find the equation of the line which satisfies each set of conditions:
passes through the point with coordinates (-2, 1) and (0, 0) d=rt. find d, r, or t.
1. r=38.5 m/h,t=12.5 h 2. d=2,730 mi,t=9.75 h

3. d=596.39 cm, r=2.3 cm/s 4. d=10.2 ft,r=0.5 ft/h