Jack and Oliver discuss their ages. Jack says, “5 years ago, I was 10 years old.” Oliver says, “My age 4 years ago is equal to Jack’s age 3 years later.” Find Oliver’s age now.
A flight from Hanoi to Phu Quoc is planned to last 130 minutes and starts at 10:15 in the morning. Bad weather makes it 20 minutes longer than planned. At what time does it arrive?
Five boxes contain apples as shown by tally marks below. Each line means one apple; a stroke across four earlier lines makes a group of five. Lucy wants equal numbers of apples in all 5 boxes. What is the smallest number of apples she must move?
The 5 × 5 square below is divided into 5 regions. Fill each cell so that every row, every column and every region contains the numbers 1, 2, 3, 4, 5. Find the number replacing the question mark.
Henry adds A and B but makes two copying mistakes: he changes A’s hundreds digit from the correct 8 to 5, and B’s units digit from the correct 3 to 9. He obtains the incorrect sum 2023. Find the correct sum.
There are 5 locks and 5 codes below. Each type of chess piece represents a digit, and each code belongs to exactly one lock. Find the correct code for lock 1.