###Human: Kirsty collects small models of animals. The last time she bought some, each one cost $0.45. She saves enough to buy 30 models, but when she goes to the shop, she finds out that the price had increased to $0.50. How many models can she buy now?, ### Assistant: Kirsty has 0.45 × 30 = $13.50 to spare to buy her models.
She can only buy 13.50 ÷ 0.50 = 27 models as the price of each individual model has increased. 
 So the answer is :  27