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svlad2 [7]
3 years ago
10

Please help me !!!

Mathematics
1 answer:
Bond [772]3 years ago
8 0
85C - 170A = 306 ---------- (1)
255 + 85B = 714 ------------(2)

(1) + (2):
85C + 85A + 85B = 1020

Divide by 85 through:
A + B + C = 12

The total of A, B ad C is 12.

-------------------------------------------------------------
Find average :
-------------------------------------------------------------
The average of A, B and C is 12 ÷ 3 = 4

-------------------------------------------------------------
Answer: The average of A, B and C is 4.
-------------------------------------------------------------
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