42% of the total number of student passed in a class test. How many students failed, if the total number of students in the class is 1450 ?

Options

A. 839
B. 831
C. 841
D. 791

Answer

To find out how many students failed in the class test, we can follow these steps:

### Step 1: Calculate the number of students who passed
We know that 42% of the total number of students passed the test. The total number of students in the class is 1450.

To find the number of students who passed, we can use the formula:
\[ \text{Number of students who passed} = \frac{42}{100} \times \text{Total number of students} \]

Substituting the values:
\[ \text{Number of students who passed} = \frac{42}{100} \times 1450 \]

### Step 2: Perform the multiplication
Calculating the above expression:
\[ \text{Number of students who passed} = 0.42 \times 1450 \]
\[ = 609 \]

### Step 3: Calculate the number of students who failed
To find the number of students who failed, we subtract the number of students who passed from the total number of students:
\[ \text{Number of students who failed} = \text{Total number of students} - \text{Number of students who passed} \]
Substituting the values:
\[ \text{Number of students who failed} = 1450 - 609 \]

### Step 4: Perform the subtraction
Calculating the above expression:
\[ \text{Number of students who failed} = 841 \]

### Final Answer
The number of students who failed the class test is **841**.

---