I had asked one of the question in Maths today which was answered by Sanjari Kalantri ma'am. But, As per the condition of the question... the answer was not at all matching. I have given another picture with the recheckment for the solution given.
According to your question, the amount that Ryan was supposed to write in the cheque was twice the amount he was left with after purchasing the pouch for Rs. 5. So, he was supposed to write Rs. 7336 in the cheque, he wrote Rs. 3673 in the cheque, and he was left with Rs. 3668 with him after he purchased the pouch. Now, Rs. 7336 is twice of Rs. 3668, or the amount Ryan was supposed to write in the cheque is twice of what he was left with after purchasing the pouch.