In Bingo, a player wins as soon as three called numbers fill one row, one column or one diagonal of their board. The teacher calls 7, 3, 2, 5, 1, 8 in that order. Which board wins first?
A store has equal numbers of apples and oranges. The apples are packed into boxes with 6 apples in each box, and the oranges are packed into boxes with 4 oranges in each box. There are 12 boxes of apples. All the boxes are full, and no fruit is left over. How many boxes of oranges are there?
Tí and Sửu each think of a two-digit number. Their numbers add to 33. Reversing the digits of Tí’s number gives Sửu’s number. What is the difference between the larger and smaller numbers?
Nam decorates a $4\times4$ grid with circles as shown. He then puts a star in every remaining cell. Which option shows all the stars that Nam puts in the grid?
A digital clock displays the times from 00:00 to 23:59 in one day. At 12:34 and 21:43, its four digits are four consecutive numbers, although they need not appear in order. How many times in one day have four digits that form four consecutive numbers?
Châu and Bình start with the same amount of money. Châu buys 4 notebooks and has 29 dollars left. Bình buys 6 notebooks and has 5 dollars left. All the notebooks cost the same. How much does one notebook cost, in dollars?
A maths contest has 10 multiple-choice questions. Each correct answer earns 4 points. Each wrong or unanswered question loses 1 point. Thanh wants more than 20 points. What is the fewest questions Thanh must answer correctly?