A prime has exactly two positive divisors, 1 and itself. Using the digits 1, 3 and 5, how many two-digit primes can Lexie form if repetition is allowed?
A store sells half its books on the first day and two thirds of the remainder on the second day. Eight books are then left. How many books were there originally?
Annie alone completes a project in 9 hours, Bailey alone in 12 hours. Together with Christine, they finish in 3 hours. How many hours does Christine need alone?
A bag contains 24 purple, 17 orange, 12 green and 26 white balls. What is the least number drawn that guarantees at least 9 purple, 3 green and 5 white balls?
A ferry takes 6 hours from A to B downstream and 10 hours back upstream. The current speed is 3 km/h. If the distance is x km, which statement is true?
When adding X and Y, the tens digit of X is mistakenly copied as 7 instead of 5, its hundreds digit as 2 instead of 6, and the units digit of Y as 6 instead of 3. The incorrect sum is 7428. What is the correct sum?
Pierce adds the lengths of three sides of a rectangular plot and gets 175 m. Luca also adds three sides, but gets 218 m. Find the area of the plot in square metres.