I explain it with 'more hens means more eggs'
Only problem I have is we live in the city and animal control only allows 6. Shhhh they don't know about my 21 chicks

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Ha. I know what you're feeling. One of my girls went broody so I stuck 6 eggs under her. i had little faith that a baby chick could actually hatch out of an egg so just to hedge my bets I ordered 8 chicks from IP to come on the 21st day of when my eggs might hatch. 6 eggs turned into 9 eggs and on the 21st day they started hatching.( all 9). I hadn't dared tell my DH that I had also ordered eggs so I stayed near the phone and when the post office called I ran out and snuck them under the broody. 2 days later I saw my husband take a second look at the chicks and saw saw the spark of understandind light his eyes. The only thing he said as he walked back toward the house was "You are crazy".
Well said.The Chicken Math that can be explained is NOT the true Chicken Math!