The station has 60 oxygen tanks. If 1/3 are used for an EVA (Extravehicular Activity), and then 1/4 of the remaining tanks are used for a backup system test, how many tanks are left?

An experiment requires 1/20 of a 500g sample of lunar soil. How many grams of lunar soil are needed?

The station has 72 hours of emergency power. If 5/8 of the power is used during a solar flare, how many hours of power were used?

A robotic arm has a reach of 90 meters. If it needs to extend 2/5 of its reach to capture a drifting satellite, how far does it need to extend?

The station’s main computer has 128 GB of memory. If 3/4 is used for operating systems and 1/8 is used for scientific data, how much memory is available for other tasks?

A fuel tank holds 200 kg of rocket fuel. If 2/5 is used for a course correction and then 1/2 of the remaining fuel is used for a docking maneuver, how much fuel is left?

An experiment requires 2/3 of a 60ml sample of a special gas. If only 1/2 of the required amount is available, how many ml of the gas are available?

The station receives 150 kg of supplies. If 2/5 are food and 1/3 are scientific equipment, how many kg of other supplies were received?

A crew member spends 1/4 of their 24-hour day sleeping, 1/3 working, and 1/6 exercising. How many hours are left for other activities?

A water tank holds 180 litres. If 2/3 of the water is used for experiments and 1/4 of the original amount evaporates, how much water is left?

The station has 144 solar cells. If 3/8 are damaged during a micrometeoroid shower, how many cells are functioning?

A container holds 100 grams of asteroid dust. If 1/4 is used for one experiment and 2/5 of the original amount is used for another experiment, how many grams of asteroid dust are left?