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avatar+111 

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)

1320 F    +    115 C = 328 ------ (2)

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

 320F + 15C = 48

3F + 4C = 960

4F + 4C = 1120

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  F = 160
  C = 280 - 160 = 120

 Jun 18, 2022

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