If x means -, + means +, - means x and + means + then `15 - 2 + 900 + 90 xx 100 =` ?

Options

A. 190
B. 180
C. 90
D. `-60`

Answer

To solve the expression \( 15 - 2 + 900 + 90 \times 100 \) with the given operations redefined, we first need to interpret the operations according to the new meanings:

- \( x \) means \( - \)
- \( + \) means \( + \)
- \( - \) means \( \times \)
- \( \div \) means \( + \)

Now, let's rewrite the expression using these new meanings:

1. **Original Expression**:
\[ 15 - 2 + 900 + 90 \times 100 \]

2. **Rewriting the Expression**:
- \( 15 - 2 \) becomes \( 15 \times 2 \)
- \( + 900 \) remains \( + 900 \)
- \( + 90 \times 100 \) becomes \( + 90 - 100 \)

Therefore, the expression becomes:
\[ 15 \times 2 + 900 + 90 - 100 \]

3. **Calculating Step by Step**:
- First, calculate \( 15 \times 2 \):
\[ 15 \times 2 = 30 \]
- Now substitute back into the expression:
\[ 30 + 900 + 90 - 100 \]
- Next, calculate \( 30 + 900 \):
\[ 30 + 900 = 930 \]
- Now substitute back:
\[ 930 + 90 - 100 \]
- Next, calculate \( 930 + 90 \):
\[ 930 + 90 = 1020 \]
- Now substitute back:
\[ 1020 - 100 \]
- Finally, calculate \( 1020 - 100 \):
\[ 1020 - 100 = 920 \]

Thus, the final answer is:
\[ \boxed{920} \]