exam Maths Puzzle Numerical Ability

Triangle ABC is an isoceles triangle with vertex angle B. AB=5X-28, AC=X+5 and BC= 2X+11. Find the length of the base

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exam Other Question

the measure of each of the congruent angles of an isosceles triangle is 9 degrees less than 4 times the vertex angle. find the measure of each angle of the triangle I keep trying over and over again but cannot find the solution to this:

(3m-2)/5 = (4-m)/3

everytime I do it i keep getting m=6.5 .