What is the volume of a box that can fit 128 cubes with 1/2 inch sides

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Find two numbers if their sum is 91 and the ratio is 6: 7?

Aiko jumped rope for 20 min and stopped at 8: 05 when did she start