Aslam buys 30 cows for an average of Rs.900. He buys 12 more by bringing the average cost to Rs.875. How much did the recent purchase cost him?

To find out how much the recent purchase cost Aslam, we need to calculate the total cost of the previous 30 cows and the recent 12 cows.

Let's start by calculating the total cost of the initial 30 cows.
Total cost of 30 cows = Average cost per cow * Number of cows
Total cost of 30 cows = Rs.900 * 30
Total cost of 30 cows = Rs. 27,000

Next, let's calculate the total cost of all 42 cows (including the recent purchase) with the new average cost.
Total cost of 42 cows = Average cost per cow * Number of cows
Total cost of 42 cows = Rs.875 * 42

Now, we need to find the cost of the recent 12 cows. We can subtract the total cost of the initial 30 cows from the total cost of all 42 cows.
Cost of recent 12 cows = Total cost of 42 cows - Total cost of 30 cows
Cost of recent 12 cows = Rs.875 * 42 - Rs.27,000
Cost of recent 12 cows = Rs.36,750 - Rs.27,000
Cost of recent 12 cows = Rs.9,750

Therefore, the recent purchase of 12 cows cost Aslam Rs.9,750.

To find out how much the recent purchase cost Aslam, we need to first calculate the total cost of the initial purchase and then subtract it from the total cost of the second purchase.

Let's solve the problem step by step:

Step 1: Calculate the total cost of the initial purchase.
Aslam buys 30 cows for an average of Rs. 900 each. Therefore, the total cost of the initial purchase is:
Total cost of initial purchase = Average cost per cow * Number of cows
Total cost of initial purchase = Rs. 900 * 30
Total cost of initial purchase = Rs. 27,000

Step 2: Calculate the total cost of the second purchase.
Aslam buys 12 more cows, which brings the average cost down to Rs. 875 each. This means that the total cost of the second purchase is:
Total cost of second purchase = Average cost per cow * Number of cows
Total cost of second purchase = Rs. 875 * 42 (including the initial 30 cows)
Total cost of second purchase = Rs. 36,750

Step 3: Calculate the cost of the recent purchase.
To find the cost of the recent purchase, we need to subtract the total cost of the initial purchase from the total cost of the second purchase:
Cost of recent purchase = Total cost of second purchase - Total cost of initial purchase
Cost of recent purchase = Rs. 36,750 - Rs. 27,000
Cost of recent purchase = Rs. 9,750

Therefore, the recent purchase cost Aslam Rs. 9,750.

12x+30*900 = 42*875