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F+C = 280   (1)

 

(1  +  1/5)C   +  (1 + 3/20)F = 328    (2)

 

now simplify and solve them simultaneously.

 Jun 18, 2022
 #1
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        F    +        C = 280 ------ (1)

\(1 {3 \over 20}\) F    +    \(1 {1 \over 5}\) C = 328 ------ (2)

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 \( {3 \over 20}\)F + \( {1\over 5}\)C = 48

3F + 4C = 960

4F + 4C = 1120

----------------------

  F = 160
  C = 280 - 160 = 120

 Jun 18, 2022

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