An urn contains 10 orange balls and 9 white balls. if frank chooses 10 balls at random from the urn what is the probability that he will select 7 orange balls and 3 white balls round your answer to 3 decimal places

Isabelle is mixing red and blue paint to make purple paint she adds 3/10 of a fluid ounce of red to 12/25 of a fluid ounce of blue to make 1 1/30 fluid ounces of purple how many fluid ounces of red paint ounces of red paint will she need to make 3 fluid ounces of purple paint