1. "What did you pay for the oranges?" asked Isla. "I saw Dellers had them like these at only 3 for 19 pence." Jan smiled. "That's what I got, and also those others at 4 for 31 pence," he told her. "Just 1 pound and 50 pence the lot." How many at each price?

10 oranges at 3 for 19p, 9 at 4 for 31p

9 oranges at 3 for 19p, 12 at 4 for 31p

7 oranges at 3 for 19p, 14 at 4 for 31p