Answer: 10 pizzas
Explanation:
To answer this you need to equate the formulas of the money earned from both pizzerias.
Assume number of pizzas is x:
Papa rons:
= 30 + 3x
This is the amount one gets for delivering a certain number of pizzas
Bombinoes
= 20 + 4x
Equate them:
30 + 3x = 20 + 4x
30 - 20 = 4x - 3x
x = 10
10 pizzas would earn you the same amount of money.