In history, it took sailors about 763 days to travel across the atlantic ocean. how long would it take them to get across one third of the ocean?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11