15:4/5

To evaluate the expression \( 15:4/5 \), we need to clarify the operations involved. It seems to involve division, so it can be interpreted as follows:

1. \( 15 \div 4 \)
2. Then, take the result and divide it by \( 5 \).

Let's calculate it step by step:

1. Divide \( 15 \) by \( 4 \): \[ 15 \div 4 = 3.75 \]

2. Now, divide \( 3.75 \) by \( 5 \): \[ 3.75 \div 5 = 0.75 \]

Thus, the value of the expression \( 15:4/5 \) simplifies to \( 0.75 \).