As suggested by Sandeep Saurav sir, I am asking the below question again. ​

Please solve the below question as soon as possible... Please Don't say that it is not of our syllabus... I know that experts can solve this using simple understanding language too:

Q) While writing the amount in the Bank Cheque for withdrawal, Ryan by mistake wrote the last two digits in place of the first two digits and first two digits in place of last two digits. While he was coming back from the bank after withdrawing, he bought a 5 rupees packet with those withdrawn money. Then.... after that, He saw and realised that whatever money {(actual/formal money amount that he should write in the cheque)}, now that is double of that. Now question is that, how much money did he withdraw?

{Remember: The number of digit in the amount/money is not mentioned yet, so it can be of 4 digits or more than that also}

Dear Student,

Let us assume that the amount Ryan had to withdraw is a 4-digit number.Also, let a be the digit in the thousands place, b in the hundreds place, c in the tens place and d in the ones place. So, the amount he had to withdraw = 1000a + 100b + 10c + d.Now, Ryan wrote the last two digits in place of the first two digits, and first two digits in place of the last two digits in the cheque.In other words, he wrote c in the thousands place, d in the hundreds place, a in the tens place and b in the ones place. So, the amount he actually withdrew = 1000c + 100d + 10a + b.Now, Ryan brought a 5 rupees pouch with the withdrawn money. So, the amount now left with him = 1000c + 100d + 10a + b - 5.Ryan now realised that the actual amount he should have written in the cheque is twice the amount left with him. 1000a + 100b + 10c + d = 21000c + 100d + 10a + b - 5 1000a + 100b + 10c + d = 2000c + 200d + 20a + 2b - 10 980a + 98b - 1990c - 199d + 10 = 0 9810a + b - 19910c + d + 10 = 0The above equation is satisfied when a = 7, b = 3, c = 3, and d = 6.So, the amount Ryan withdrew = 1000c + 100d + 10a + b = 3000 + 600 + 70 + 3 = Rs. 3673NOTE: The above amount is not unique. There can be more solutions to this question, where the amount withdrawn could be a 5-digit, 6-digit, or a number with greater number of digits - it must satisfy the given conditions.
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