Nobody on the planet uses Imperial gallons anymore, the US uses US gallons and the UK (British) dropped the Imperial gallon when they went Metric (SI) in the 60s
Go back and check then re-ask the Q
1in = 2.54cm 40cm x 1in/2.54cm = 15.7in
1in = 2.54cm 7.5in x (2.54cm/1in) = 19.05cm
1in = 2.54cm 0.2cm x 1in/2.54cm = 0.08in
1in = 2.54cm 270cm x 1in/2.54cm = 106 (rounded)
1in = 25.4mm 18mm x 1in/25.4mm = 0.71in (rounded)
1in = 2.54cm 1in2 = 1in x 1in = 2.54cm x 2.54cm = 6.4516cm2 680cm2 / 6.4516 ~= 105.4in2
16ft 1in = 16 x 12in + 1in = 193in 1in = 0.0254m 193in = 193 x 0.0254m ~= 4.9m
154.94
4 of them.
It would be 8 in as 7 cuts produces 8 slices of the loaf. An illustration of the cuts is as follows : 1in|1in|1in|1in|1in|1in|1in|1in
1 inch is 25.4mm
you have 3 of them ,1in each exhaust manifold and 1 in one of the pipe leaving the exhaust manifold.