On a certain hot​ summer's day, 522 people used the public swimming pool. The daily prices are 1.50 for children and 2.50 for adults. The receipts for admission totaled $1156 how many children and how many adults swam at the public pool that​ day?

Abag contains 4 red, 7 blue and 5 yellow marbles. event a is defined as drawing a yellow marble on the first draw and event b is defined as drawing a blue marble on the second draw. if two marbles are drawn from the bag, one after the other and not replaced, what is p(b|a) expressed in simplest form? a. 7/16 b. 7/15 c. 14/16 d. 14/15