Ok, if you say so. Jean took 1/2 hour to complete 3/8 of a math problem.
No they are part fundamental mathematics
The centre point is given by;

=

=

=(4, -5)
If he buys 2 lbs of sunflower seed and 2 lbs of regular seed he will have 4 lbs of seed, for what he paid 16+12=28 dollars
so 28/4=7 dollars per pound <span />