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Jawab :
C : R : F
5 : 4 : 9
40⁰R=.......⁰C
C= 5/4 × 40
= 5 × 10
= 50⁰C
40⁰R=.....⁰F
F= (9/4 × 40) + 32
= (9 × 10) + 32
= 90 × 32
= 122⁰F