What is the angle between the hour hand and the minute hand of a clock at 7:20? (answer in degrees)

The minute hand moves 6° per minute, so at 20 minutes it is at $20\times 6=120$° from the 12 mark. The hour hand moves 30° per hour plus 0.5° per minute, so at 7:20 it is at $7\times 30+20\times 0.5=210+10=220$°. The angle between them is 220 − 120 = 100°.