john needs 20 grams of a 54% acid solution for his science project. His school's science lab has bottles of 30% solution and bottles of 60% solution how much of each should he use

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

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

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers