exam Maths Puzzle Numerical Ability

Solve the following equations for the unknown.

x/3 - 7/8 = 2/5(x + 15/4)

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exam Other Question

Use one unit multiplier to convert 25 meters to centimeters.I am having so much trouble with this problem could u pleasa help me with this? thank you. please help me solve the equation:
4x^2 + 2x - 20