Maxim ate 4/9 of the pizza, while Ayana ate 1/6 of the pizza. How many parts of the pizza are left?
7/18
15
A group of researchers went on an expedition to Saturn. They collected 3/5 of soil samples and then an additional 2/15. How many samples, in total, did they collect?
11/15
15
On the planet Mars, there were 9/10 crystals. Then, 1/5 of the crystals were used for the construction of a base. How many crystals are left on the planet?
7/10
15
An alien researcher collected 4/6 samples of gas on the space station. How many more samples does he need to collect to complete the research?
1/3
15
The spacecraft delivered 6/10 of the required resources to Mercury. How many more resources does it need to deliver to complete the mission?
2/5
15
In the Andromeda galaxy, there were 20 planets. An alien visited 2/5 of them. How many planets did the alien visit?
8
15
On the planet Venus, there were 9 oceans. Then, 2/3 of the oceans dried up. How many oceans are left?
3
15
A space astronomer discovered 1/4 of the new stars in the galaxy. If there are a total of 200 billion stars in the galaxy, how many stars did he discover?
50 billion stars
15
If three aliens weigh 30 kg, then how much do five aliens of the same kind weigh?