If A is less than B, B is 2 more than C and C is 3 less than D. How much more or less is A than D.
A<B
B=2+C sp
A<2+C
and C=D-3 sp
A<2+D-3 or A<D-1 so A is less than D by one.
B=2+C sp
A<2+C
and C=D-3 sp
A<2+D-3 or A<D-1 so A is less than D by one.