Question

Michael's rock collection is 27% igneous rock. Half of his collection is sedimentary rock, while the rest is metamorphic rock. How much of the collection is metamorphic rock?

Answer 1

23% of Michael's rock collection is metamorphic rock.

Explanation:

We are given the following in the question:

Percentage of igneous rock in the collection = 27%

Percentage of sedimentary rock in the collection = 50%

Remaining rocks are metamorphic rock.

Total collection = 100%

Percentage of metamorphic rocks =

`=100\%-(27\%+50\%)\\=100\%-77\%\\=23\%`

Thus, 23% of Michael's rock collection is metamorphic rock.