Rohan spends Rs. `x` daily and saves Rs. `y` per week. What is his income after `3` weeks?

Options

A. `21x+3y`
B. `21-3y`
C. `21x` `xx3y`
D. `7x+3y`

Answer

To find Rohan's income after 3 weeks, we need to consider both his spending and his savings over that period. Here’s how we can break it down step by step:

### Step 1: Calculate Rohan's Total Spending in 3 Weeks
Rohan spends Rs. `x` daily. To find out how much he spends in 3 weeks, we first need to determine how many days are in 3 weeks.

- **Number of days in 3 weeks** = 3 weeks × 7 days/week = 21 days

Now, we can calculate his total spending over these 21 days:

- **Total Spending** = Daily Spending × Number of Days
- **Total Spending** = `x` × 21 = Rs. `21x`

### Step 2: Calculate Rohan's Total Savings in 3 Weeks
Rohan saves Rs. `y` per week. To find out how much he saves in 3 weeks, we simply multiply his weekly savings by the number of weeks:

- **Total Savings** = Weekly Savings × Number of Weeks
- **Total Savings** = `y` × 3 = Rs. `3y`

### Step 3: Calculate Rohan's Total Income in 3 Weeks
Rohan's total income after 3 weeks is the sum of his total spending and total savings:

- **Total Income** = Total Spending + Total Savings
- **Total Income** = Rs. `21x` + Rs. `3y`

Thus, Rohan's income after 3 weeks is:

- **Total Income** = Rs. `21x + 3y`

### Final Answer:
Rohan's income after 3 weeks is Rs. `21x + 3y`.

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