Bài 1: Fill in the blank with the suitable sign ( > ; < ; = ) ; 

  compare : 7,12 : 0,5 + 8, 23 ....... 28,48 : 2 + 4,12 : 0,5 

Bài 2 : If 144 / 17 < n < 169 / 34  :  13 / 68 and n is a natural number then n = .....

Bài 3 Divide 77 into three pats so that one is 150 %  of each of the other two . The smaller number is ... 

                                                      ( Giải chi tiết nhé. Trả lời nhanh , đúng cho 3 like )

Ann and Bob have a large number of sweets which they agree to share according to the following rules. Ann will take one sweet, then Bob will take two sweets and then taking turns, each person takes one more sweet than what the other person just took. When the number of sweets remaining is less than the number that would be taken on that turn, the last person takes all that are left. To their amazement, when they finish, they each have the same number of sweets

They decide to do the sharing again, but this time, they first divide the sweets in two equal piles and then thay repeat the process above with each pile. Ann going first both times. They still finish with the same number of sweets each. 

What is the maximum number of sweets less than 1000 they could have started with ?