exam Maths Puzzle Numerical Ability

hi please help me i dont understand this problem

in equilateral triangle DEF, Measure of angle D = x+y
and measure of angle E = 2x-y

please answer thanks a lott

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exam Other Question

The mean of all the observations of an experiment is called the ___________ mean.
a. group
b. treatment
c. block
d. grand Please help me understand .
The equation is : ( a^-1 + b^-1)^2 . I need to simplify it. The answer is (b^2+2ab+a^2)/a^2*b^2.
Can you explain why. Why after using a common denominator , the " 2ab" is out of the fraction?
Thank you . Viktor