一块长方形的纸，长75厘米，宽60厘米。要把这张纸裁成面积相等的小正方形的纸而无剩余，且使边长最长，问可裁成几张？

Ah Seng, who owned a rare vintage car offered to sell it to his friend Ramu. The offer was made through a letter dated 1 May 2011, which was posted on the same day. The letter expressly stated that the offer was only open until 10 May 2011. Ramu received the letter on 5 May 2011 and immediately posted his letter of acceptance to Ah Seng. Due to a postal delay, this letter reached Ah Seng only on 12 May 2011. Meanwhile, on 11 May 2011, Ah Seng, not having heard from Ramu, sold the car to someone else.Required:Advise Ramu:

(a) whether he can successfully sue Ah Seng for breach of contract; and (5 marks)