A bike travels at a constant speed of 12 km/h. A car starts 16 km behind the bike and catches up to the bike in half an hour. What is the average speed of the car in km/h?
Three friends buy 30 pencils for \$15 and initially divide them equally. Anna pays \$8, Bob \$5 and Candace \$2. If pencils were divided in proportion to their payments, how many more would Anna receive?
A bag of 8 apples costs \$12 and a box of 5 mangoes costs \$8. Only whole bags and boxes can be bought. Henry buys exactly 100 fruits, including apples and mangoes. What is the least total cost?
A large cuboid of surface area 1872 cm² is made from identical small cuboids as shown. Each small cuboid has exactly two square faces. Find the volume of one small cuboid.
A box contains balls numbered 1 to 100. Drawing and keeping each ball costs \$2. A participant wins upon having two balls whose numbers differ by 18. What is the minimum amount that guarantees a win?
People sit in equally sized rows at a conference. Adding 4 rows reduces each row by 6 people. Removing 2 rows increases each row by 4 people. How many people attend?