book Maths Puzzle Numerical Ability

On Saturday morning, Lynn walked for 2 hours and then ran for 30 minutes. If she ran twice as fast as she walked and she covered 12 miles altogether, then how fast did she walk?

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book Other Question

Simplify and and answer with positive exponents only.

[(-12x^5y^-4)/(3x^-2y)]^-2

x to the power of 5, y to the power of negative 4, 3 to the power of negative 2, y to the power of one

everthing in brackets to the power of negative 2 On a recent safari, a group of people and elephants contained 100 knees and 100 trunks. If each person took 3 trunks, how many people and how many elephants went on the safari?