16. Find how many cups of 30% grape milk and 80% grape milk should be mixed to obtain 15 cups of 60% grape milk?
Please (1) define the variable(s), (2) write an equation (or system of equations) for the problem, (3) solve
the equation (or system of equations), and (4) answer the question in a sentence.

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?