Câu 67. Let ab,cd be a decimal number such that its last digit is 4. If the 4 is moved to the front of the number, it becomes 10 times greater.
Find ab,cd.
Câu 68. Let abc,def be a decimal number such that its last digit is 4. If the 4 is moved to the front of the number, it becomes 40 times greater.
Find abc,def .
Câu 69 : Max starts with savings of £12. Millie starts with no savings. Each week from now, Max will save £3.50 and Millie will save an amount of money. In 8 weeks Max and Millie will have savings in the ration 
. How much will Millie save each week?
Answer: Millie will save £ …
Max starts with savings of £9. Millie starts with no savings. Each week from now, Max will save £4.50 and Millie will save an amount of money. In 6 weeks Max and Millie will have savings in the ration . How much will Millie save each week?
Answer: Millie will save £...
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mik cám ơn trước ạ
Dịch:
Câu 67. Cho ab, cd là số thập phân sao cho chữ số tận cùng của nó là 4. Nếu chuyển 4 lên trước số đó thì số đó lớn hơn 10 lần.
Tìm ab, cd.