solve for a and b. (ignore the yellow spaces and my extra workumbers)

Anne Dietz at Changi \#3 6aud(Singapore). Anne Dietz lives in Singapore, but is making her first business trip to Sydney. Australia. Standing in Singapore's new terminal \#3 at Changi Airport, she looks at the foreign exchange quotes posted over the FX trader's booth. She wishes to exchange 1,500 Singapore dollars (SS or SGD) for Australian dollars (AS or AUD). What Anne sees