Only one in ten people can solve this puzzle – can you?

Let’s count:
Onion × Onion = 9
This means that one onion = 3 (because 3 × 3 = 9)
Chicken + Chicken = 20
This means that one chicken = 10 (because 10 + 10 = 20)
Last row:
Onion + Chicken × Onion