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(4a)(b/2) = (4ab)/2 = (4*60)/2 = 120
(2a)(b/4) = (2ab)/4 = (2*60)/4 = 30
(6a)(b/3) = (6ab)/3 = (6*60)/3 = 120
(a/2)(b/10) = (ab)/20 = (60)/20 = 3