Gold is 19 times a heavy as water and copper is 9 times as heavy is water. In what ratio should these be mixed to get an alloy 15 times as heavy is waster? `1:1` b. `1:2` c. `2:3` d. `3:2`

Explanation

To solve the problem of mixing gold and copper to obtain an alloy that is 15 times as heavy as water, we can follow these steps:

### Step-by-Step Solution:

1. **Define the Weights of Gold and Copper:**
- Let the weight of water be represented as \( W \).
- The weight of gold \( G \) is 19 times that of water:
\[
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