Mavis' money and Gina's money were in the ratio 5:2. After mavis spent $1.20 and Gina saved some money so that she now has $3.50, the ratio of Mavis' money to Gina's money was 4:5. How much money did Mavis have at first

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