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Enter numbers in the circles so that the numbers on each line equal the sum of the numbers at each end.

Enter Numbers In The Circles So That The Numbers On Each Line Equal The Sum Of The Numbers At Each End class=

Sagot :

simple 
in the top circle write 34
in the left bottom write 9
in right bottom write 21
so now 9 + 21 =30
34 + 9 = 43
34 + 21 =55
so it fits in circle

SMILE

The correct answers are:


Top circle: 34

Bottom left: 9

Bottom right: 21


Explanation:


Let the top circle be x, let the bottom left circle be y, and the bottom right circle be z.


Following the diagram, we have the following equaitons:

x+y = 43

y+z = 30

x+z = 55


Taking the first two equations as a system, we will eliminate y:


[tex] \left \{ {{x+y=43} \atop {z+y=30}} \right. [/tex]


We will subtract the bottom equation from the top:

[tex] \left \{ {{x+y=43} \atop {-(z+y=30)}} \right.
\\
\\x-z=13 [/tex]


We will now take this and the last equation as a system; this time, we will eliminate z by adding the two equations:

[tex] \left \{ {{x-z=13} \atop {+(x+z=55)}} \right.
\\
\\2x=68 [/tex]


Divide each side by 2:

2x/2 = 68/2

x = 34


Substitute this into the first equation:

x+y = 43

34+y = 43


Subtract 34 from each side:

34+y-34 = 43-34

y = 9


Substitute this into the second equation:

y+z = 30

9+z = 30


Subtract 9 from each side:

9+z-9 = 30-9

z = 21