Level 3
A tank containing some water and 7 identical stones has a mass of 1 kg 235 g. When the 7 stones were taken out, the mass of the tank of water became 759 g. Find the mass of each stone. (Give the answer in grams.)
4 m
Level 3
A box containing 3 similar mugs weighs 1.2 kg. The same box and 2 of the mugs weigh 980 g. Find the mass of the empty box.
4 m
Level 3
There are 48 oranges in a box. Each orange weighs 150 grams. Find the total mass of the oranges, in kilograms, in
  1. 1 box.
  2. 5 such boxes.
4 m
Level 3
There are 42 boxes of cakes. 3 of these boxes are without ribbons. The ribbon used for each box is 12 cm long.
  1. How many of the boxes are with ribbons?
  2. What is the total length of the ribbons used for the boxes? (Give the answer in meters and centimeters.)
4 m
Level 3
Eric has a total of 14 fifty-cent and ten-cent coins. The total value of the coins is $3. If he spends all the fifty-cent coins on a stapler, how much does the stapler cost?
4 m