Level 3
The mass of a stone is 42 g. The total mass of this stone and 5 identical marbles is equal to the total mass of 8 such marbles.
  1. Find the mass of each marble.
  2. Find the total mass of 1 stone and 5 marbles.
4 m
Level 3
There were 3 similar big boxes of the same mass. There were another 4 similar small boxes of the same mass. The total mass of the big and small boxes was 90 kg. The mass of a big box was twice the mass of a small box. Find the total mass of a big box and a small box.
4 m
Level 2
The mass of a box and one bag of potatoes is 1280 g. The mass of the same box and 2 similar bags of potatoes is 2040 g. What is the mass of a bag of potatoes?
4 m
Level 3
A bag and 3 watermelons weigh 18 kg. The same bag and 1 such watermelon weighs 12 kg. What is the mass of each watermelon?
4 m
Level 3
Study the diagram. Find the value of the pentagon.
4 m
Level 2
The mass of a guava and 3 apples is 2 kg 50 g. The mass of the same guava and 2 similar apples is 1 kg 800 g. What is the mass of 3 apples? Give the answer in g.
4 m
Level 2
The mass of a tub and a packet of flour is 3100 g. The mass of the same tub and 4 similar packets of flour is 9 kg 340 g.
  1. What is the mass of a packet of flour?
  2. What is the mass of the tub?
Give your answers in kg and g.
4 m
Level 3
A television and 4 speakers cost $520. The same television and 2 such speakers cost $400. Find the cost of the speaker.
4 m
Level 3
The mass of a container and 2 metal balls is 2 kg 100 g. The mass of the same container and 5 similar metal balls is 3 kg 750 g.
  1. What is the mass of each metal ball in g?
  2. What is the mass of the container in kg?
4 m
Level 3
2 dictionaries and 2 exercise books cost $50. 1 dictionary and 2 exercise books cost $28. Find the cost of 1 exercise book.
4 m