Angles

Question

Addition.JPG Can some one explain the answer?

shaselai · Answer

4 + x=1 so x =-3
x + e = 7 so -3 +e = 7 so e = 10
e + z = 10 10 +z =10 z=0
4 +Z =m 4 +0 = 4
y + 4=-5 y = -9
y + e =n -9 + 10 = 1
so m=4, n =1 m+n =5 C

vigneshpandi · Answer

I am thinking too much..Did not realise it is so simple until I saw ur solution. 
I should practice not to panic in the practice tests otherwise even a simple problem may look very complex..
Thank you and +1 for u

BigRedEnvEng · Answer

Another option:

You know the following:

m = 4 + z
n = e + y

Take a look at the rest of the table to see if you can immediately determine the value of z, e, and y. There is for y:

4 + y = -5
Therefore y = -9

Substitute this into the equation for n:

n = e - 9

If you look at the table, there's also a relationship between e and z:

10 = e + z

Knowing that z is in the equation for m, substitute e with an equation involving n:

e = n + 9
z = 10 - (n + 9) = 10 - n - 9
m = 4 + (10 - n - 9) = 4 + 10 - n - 9

Move the n over to the same side of the equation as the m:

m + n = 4 + 10 - 9 = 5

Angles

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