Ladybugs, Eggs, and Aphids

My friend showed me her ornamental maple tree with lots of ladtbugs and even more aphids.
A ladybug eats 50-75 aphids a day and the ladybug larvae eat up to 400 aphids a day. 
The  extra photo shows ladybugs making more eggs, to make more larvae, to maintain the balance.
I was cheering loudly for them!