C? I'm not sure. It seems like the most reasonable answer.
Given:
x = beginning number of newspapers
24 = sold in the morning
(x - 24) * 2/7 = sold in the afternoon
x * 1/2 = remaining newspapers
5/7 of the remaining newspaper is equal to 1/2 of the original number.
(x - 24) * 5/7 = 1/2 * x
5x/7 - 120/7 = x/2
5x/7 * 2/2 - 120/7 * 2/2 = x/2 * 7/7
10x/14 - 240/14 = 7x/14
10x/14 - 7x/14 = 240/14
3x/14 = 240/14
14 * 3x/14 = 14 * 240/14
3x = 240
x = 240/3
x = 80
80 - 24 = 56 remaining newspaper in the morning
56 * 2/7 = 16 sold in the afternoon
80 - 24 - 16 = 80/2
40 = 40 remaining newspaper for the day.
Given this situation, you need to design the dimensions of the cylindrical plastic glass. And then, determine the optimum thickness of the outside layer for the water. The temperature limits of the material should also be considered for safety and durability purposes.
It is neither likely or unlikely to pull a purple marble because there is an even number of blue and purple marbles.
