1. “So Miss Stanton’s your new teacher,” Sam commented. “D’you like her?” “She’s okay.” Doug grinned. “But I haven’t worked out how old she is. She told us we can get her age by adding five times its last figure to three times its first.” You work it out.

Miss Stanton is 31 years old

Miss Stanton is 38 years old

Miss Stanton is 47 years old