In 2010, a skating team had a total of 35 skaters, each classified as either advanced or intermediate. From 2010 to 2020, the number of advanced skaters on the team increased by approximately $39$%, and the number of intermediate skaters on the team increased by approximately $47$%. The total number of skaters on the team increased by approximately $43$%. Which equation best represents this situation, where $a$ represents the number of advanced skaters on the team in 2010 and $b$ represents the number of intermediate skaters on the team in 2010?