1. Susan was showing Dick the handkerchiefs she had just bought. "Your mother loves lace," she said. Her husband nodded. "They're beautiful," he commented. "I bet they cost quite a bit." "One penny under seventeen pounds," Susan replied. "They were at three prices, ten pence apart. I got most of the cheapest, one less at the next price, and one less again at the most expensive." How many had she bought?

11

13

9