Each cm contains 10mm so 1165cm is 1165*10 = <<1165*10=11650>>11650mm
154-150 = <<154-150=4>>4 pieces of the rope are 100mm each in length
The 4 pieces have a total length of 4*100 = <<4*100=400>>400mm
There is a length of 11650-400 = <<11650-400=11250>>11250mm left
11250 mm into 150 equal pieces will give each piece as 11250/150 = <<11250/150=75>>75mm long
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