I started with the Area, substituted R for x and y. Worked out the starting area which was my maximum. Transposed the diameter formula to give me Y=1-X
Differentiated the transposed area formula using the (1-X) which got rid of Y, so eventually I got x=0.5, I put this in the original area...
I believe I have cracked it, however will not know until it has been submitted so still need to try different angles to see what else I can come up with.
Can someone help me as a am racking my brain. I have been given this question;
Two oil pipes with circular cross-sections are subject to the constraint that the sum of their
diameters is 1m. By using careful reasoning find the diameters that give the maximum and
minimum possible combined...