Answer:
The answer is 11!
Step-by-step explanation:
let box B= x
box A=13/4+x
box C=11/4+x
A.T.Q
13/4+x+x+11/4+x=39
13+4x+4x+11+4x/4=39
24+12x/4=39
24+12x=156
12x=132
x=11
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Answers & Comments
Answer:
The answer is 11!
Step-by-step explanation:
let box B= x
box A=13/4+x
box C=11/4+x
A.T.Q
13/4+x+x+11/4+x=39
13+4x+4x+11+4x/4=39
24+12x/4=39
24+12x=156
12x=132
x=11