1. "We're going to have a new maths teacher," said Bob. "Miss Dibbins told us today. She said she's going to retire." Gwen shook her head. "I'm sorry to hear it, as I know you like her." "That's right, she makes it fun," the boy declared. "She told us her age is seven times its last digit plus three times its first." Well?

Age 78 years

Age 67 years

Age 76 years