book Maths Puzzle Numerical Ability

I need your help on changing word phrases to mathematical sentences, I need your answers as soon as possible.

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simplify:

6a^-2 b^3 c^-2/12a^4 b c^-1
A triangle has an 8 inch base and a height of 4 inches. A second triangle has three-fourths the area and half the height of the first triangle. What is the length of the base of th