I would appreciate some help! :)

Consider an exchange economy with 2 consumers (A and B) and 2 goods (x1 and x2). Consumer A's utility function is given by = xi + a,x2, where a is some constant, and Consumer B's utility function is given by UB = x1 + bx2, where b is some constant. Suppose that a=176 and b=9. At a Pareto optimal allocation in which both individuals consume some of each good, how much x2 does Consumer A consume? (Answer up to 2 decimal places.)