4 years ago

I’m giving brainliest

1 answer:

Katen [24]4 years ago

7 0

Answer:

z=-7

Step-by-step explanation:

x+y=22(double the average as there are two parts

x+y+z=22 (as shown in the last part)+z=15 (average tripled as there are three parts

22+z=15

z=15-22

z=-7

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