They think, Okay, so I know an egg  weighs 20 grams.. But the sentence is not just saying it weighs 20  grams. It says it weighs 20 grams AND half an egg. If you read it  backwards, you would understand. Let's try, An egg weighs half an  egg and 20 grams.. Two halves make one.
Diamond Valley Lake lies between two mountains in California's Inland Empire tourism region. The 4,500-acre lake is Southern California's newest and largest reservoir. It has only been at full pond since 2002 and already has been crowned the Jewel of California lakes, with a reputation for excellent fishing.
In addition to largemouth bass and rainbow trout, Diamond Valley Lake is home to blue gill, catfish, crappie, pan fish, smallmouth bass, and striped bass. The record largemouth bass, reeled in back in 2007, weighed in at more than 16 pounds.