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.)
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?