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F = (9/5)C - 32
F-32 = (9/5)C
C = (F-32) / (9/5)
C = (5/9) x (F-32)
Batas bawahnya 68⁰F
maka
68⁰F = (5/9) x (F-32) ⁰C
= 5/9 x (68-32) ⁰C
= 5 x 36 / 9 ⁰C
= 180 / 9 ⁰C
= 20⁰C
Batas atasnya 77⁰F
maka
77⁰F = (5/9) x (F-32) ⁰C
= 5/9 x (77-32) ⁰C
= 5 x 45 / 9 ⁰C
= 225 / 9 ⁰C
= 25⁰C
Jadi range suhunya dalam C adalah 20⁰C sampai 25⁰C.
Semoga membantu.... ^_^