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Question

Pls help to solve, if possible pls provide a model. Thank you so much!

Answer

B + C = A + 5.90 … (1)

A + C = B + 20.70 … (2)

(2) – (1):
A – B = B – A + 14.80
2A – 2B = 14.80
A – B = 7.40

So Adam has $7.40 # more than Bryan.

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Alternative Solution:

[———B————–][——–C———–]

[————–  A—————–]<–5.90—>

A – B = C – 5.9

[—————A—————–][——–C———–]

[———B————–] <———20.70————>      

A – B = 20.7 – C

To eliminate C,  add the 2 equations, 

2(A-B) = 14.80

A-B = 7.40

Hence Adam has $7.40 more than Bryan.

 

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