arithmetic functions take all appropriate numeric arguments

CG-USER(34): (+ 60 5.0 1/2)

65.5

CG-USER(35): (- 60 5.0 1/2)

54.5

CG-USER(36): (* 60 5.0 1/2)

150.0

CG-USER(37): (/ 60 5.0 1/2)

24.0

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