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Given volume = l*b*h = 4.8*3.5*h = 42
=> h = 42/(4.8*3.5)
=> h = (42*10*10)/(48*35)
=> h = (7*10*10)/(8*35) (42 and 48 is divided by 6)
=> h = (10*10)/(8*5) (7 and 35 is divided by 7)
=> h = (10*2)/8 (5 and 10 is divided by 5)
=> h = 20/8
=> h = 2.5