1. “Forty questions, but you don’t have to answer them all,” said Tom. “I give you 12 pence for every one you get right.” “Sounds great, Dad,” replied Bill. “But what about the ones I get wrong?” Tom chuckled. “That’s different. You pay me 25p the first you get wrong, 50p the next, 75p the third, and so on.” That’s how it went. Bill ended up £2.01! How many questions did he answer?

Bill answered 29 questions (5 wrongly)

Bill answered 25 questions (2 wrongly)

Bill answered 23 questions (8 wrongly)