Cambridge Secondary (7-9). Stage 9. MCE Science. Student Book - Unit 9: Density - Question 45

A man takes some gold to a jeweller to have a ring made. When he collects the ring, he becomes suspicious that the jeweller may have mixed some cheaper silver into the gold. To investigate, the man takes the ring, along with a pure gold ring and a pure silver ring, and measures the mass and volume of each ring. Based on the following measurements, determine whether the jeweller has replaced some of the gold with silver. Explain your answer.

| | Pure gold ring | Pure silver ring | Ring from jeweller |
|:-|:-:|:-:|:-:|
| Mass / g | 37.44 | 26.99 | 27.95 |
| Volume / cm³ | 1.94 | 3.57 | 2.35 |