Which one of the following is wrong?

Options

A. `(9)/(4)+1.75=4`
B. `(9)/(5)+2.2=4`
C. `(6)/(3)+2.8=4`
D. `(3)/(2)+1.5=4`

Explanation

To determine which of the given equations is incorrect, we will evaluate each equation step by step.

### Step 1: Evaluate the first equation
**Equation:** \( \frac{9}{4} + 1.75 \)

1. Convert \( \frac{9}{4} \) to a decimal:
\[ \frac{9}{4} = 2.25 \]

2. Add \( 2.25 + 1.75 \):
\[ 2.25 + 1.75 = 4.00 \]

**Conclusion:** The first equation is correct.

### Step 2: Evaluate the second equation
**Equation:** \( \frac{9}{5} + 2.2 \)

1. Convert \( \frac{9}{5} \) to a decimal:
\[ \frac{9}{5} = 1.8 \]

2. Add \( 1.8 + 2.2 \):
\[ 1.8 + 2.2 = 4.00 \]

**Conclusion:** The second equation is correct.

### Step 3: Evaluate the third equation
**Equation:** \( \frac{6}{3} + 2.8 \)

1. Convert \( \frac{6}{3} \) to a decimal:
\[ \frac{6}{3} = 2 \]

2. Add \( 2 + 2.8 \):
\[ 2 + 2.8 = 4.8 \]

**Conclusion:** The third equation is incorrect.

### Step 4: Evaluate the fourth equation
**Equation:** \( \frac{3}{2} + 1.5 \)

1. Convert \( \frac{3}{2} \) to a decimal:
\[ \frac{3}{2} = 1.5 \]

2. Add \( 1.5 + 1.5 \):
\[ 1.5 + 1.5 = 3.0 \]

**Conclusion:** The fourth equation is also correct.

### Final Answer
The incorrect equation is the third one: \( \frac{6}{3} + 2.8 \) which equals \( 4.8 \) instead of \( 4 \).

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