Evaluate: `(21)/(60) = (x)/( 40)`

Answer

To solve the equation \( \frac{21}{60} = \frac{x}{40} \), we will use cross multiplication to find the value of \( x \).

### Step-by-Step Solution:

1. **Set up the equation**: We start with the equation \( \frac{21}{60} = \frac{x}{40} \).

2. **Cross multiply**: This means we will multiply the numerator of one fraction by the denominator of the other fraction. So, we have:
\[ 21 \times 40 = 60 \times x \]

3. **Calculate \( 21 \times 40 \)**:
\[ 21 \times 40 = 840 \]
So, we can rewrite the equation as:
\[ 840 = 60x \]

4. **Isolate \( x \)**: To find \( x \), we need to divide both sides by 60:
\[ x = \frac{840}{60} \]

5. **Simplify \( \frac{840}{60} \)**: We can simplify this fraction. Both 840 and 60 can be divided by 60:
\[ x = 14 \]

6. **Final answer**: Thus, the value of \( x \) is \( 14 \).

### Summary:
The solution to the equation \( \frac{21}{60} = \frac{x}{40} \) is \( x = 14 \).