exam Maths Puzzle Numerical Ability

An isoceles triangle has a perimeter of 45cm. Its equal sides each measure 6cm longer than the base. How long is the base of the triangle?

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Please help me solve this problem: -4/8 < 2/3c. I understand how to get the 2/3 on the other side but when I get to the multiplying part I get stuck. The average age of Amtrak passenger train cars is 19.4 years. If the distribution of ages is normal and 20% of the cars are older than 22.8 years, find the standard deviation.