exam Maths Puzzle Numerical Ability

"In the triangle ABC, measure of angle A= 60 degrees and the measure of angel C = 80 degrees. The exterior angle at B measures(x+10).

What is the value of x?"
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exam Other Question

Choose values of x, then simplify it correctly.
10x^2-30x+20/x^2-1
I did something wrong on that one, maybe someone could show me how it works. 11. The population of Bayside decreased from 16,000 to 15,120. What was the percent of decrease? I used the equation 880/15120= x/100 and got 5.82.

12. The sales tax on a comput