Kofi borrowed GH¢50 from his friend. He then spent GH¢30 on food and earned GH¢20 from a job. Which expression correctly represents his financial situation?

• Borrowing GH₵50 means a debt, so it's represented as $-50$.
• Spending GH₵30 means a decrease in money, so it's represented as $-30$.
• Earning GH₵20 means an increase in money, so it's represented as $+20$.

The financial situation is the sum of these transactions:

This matches option B.

The final answer is $\boxed{\text{B. } -50 - 30 + 20}$.

23. Two numbers have a ratio of 5:3. If their sum is 40, what is the larger number?

Let the two numbers be $5x$ and $3x$, where $x$ is a common multiplier.

The sum of the two numbers is 40:

The two numbers are $5x$ and $3x$.
The first number is $5 \times 5 = 25$.
The second number is $3 \times 5 = 15$.
The larger number is 25.

The final answer is $\boxed{\text{C. } 25}$.