A group of children plants 30 flowers in this repeating order: chrysanthemum, rose, lily, gerbera, gerbera, lily, chrysanthemum, rose, lily, gerbera, gerbera, lily, chrysanthemum, … How many lilies do they plant?
A die has six faces numbered 1,2,…,6. Every even number is divided by 2, and every odd number is multiplied by 2. What is the sum of the six new face numbers?
A pirate has two chests. The left chest contains 10 gold coins and the right chest is empty. Starting tomorrow, he adds 1 coin to the left chest and 2 to the right chest each day. After how many days will they contain the same number of coins?
A dog has two equally heavy puppies. The dog and one puppy weigh 14 kilograms; the dog and both puppies weigh 18 kilograms. How much does the dog weigh?